People with major depressive disorder typically give up their productivity and their motivation to complete daily tasks. Below is a comprehensive list of some of the most common symptoms of major depressive disorder.

When people are living with major depressive disorder, they experience emotional symptoms (feeling sad and dejected), motivational symptoms (loss of desire to pursue usual activities and duties), behavioral symptoms (feeling less active and less productive), cognitive symptoms (holding negative views of self, like feeling inadequate, undersireable, inferior, worthy of blame), and physical symptoms (experiencing headaches, indigestion, constipation, dizzy spells, and general pain).

Preoccupation with schedules and productivity is more indicative of an obsessive-compulsive disorder than a depressive disorder.

Learned helplessness is the perception that, based on past experiences, an individual has no control over reinforcements (rewards, punishments) in his/her life. These individuals also tend to believe that they themselves are entirely responsible for this helpless state.

Dsythymia and major depressive disorder are both mood disorders, specifically focused on depressive symptomology. The main difference between them is that dsythymia is a low grade depression that lasts multiple years, while major depressive disorder is a single, severe depressive episode.

Panic disorder is an anxiety disorder, not a depressive disorder. All other listed answer options are depressive disorders.

Dysthymia (also known as dysthymic disorder) is a mild, but long-term, form of depression. Symptoms usually last for at least two years, and cause significant interference in aspects of daily life and work. 

Major depressive disorder is the most common mood disorder and is characterized by a depressed mood and physical symptoms such as loss of appetite and fatigue for 2 or more weeks in the absence of a clear cause. SAD has the symptoms of major depressive disorder but the episodes occur seasonally, typically during winter. Dysthymia is similar to major depressive disorder but it is less severe and lasts longer (at least 2 years). Bipolar disorder involves episodes of both depression and mania. Minor depressive disorder is still being researched and you do not have to know it for the AP Psychology exam. 

Major depressive disorder is the most common mood disorder and is characterized by a depressed mood and physical symptoms such as loss of appetite and fatigue for 2 or more weeks in the absence of a clear cause. SAD has the symptoms of major depressive disorder but the episodes occur seasonally, typically during winter. Dysthymia is similar to major depressive disorder but it is less severe and lasts longer (at least 2 years). Bipolar disorder involves episodes of both depression and mania. Minor depressive disorder is still being researched and you do not have to know it for the AP Psychology exam.

Beck's cognitive triad examines the explanations people make about themselves, their future, and their world. When something happens, someone can decide that it was either caused by them or caused by an external factor (internal/external), generalize the event to all events or keep it specific to the event at hand (global / specific), and decide whether he or she thinks it will continue in the future or will end soon (stable/unstable). When something good happens, such as a job promotion, someone who is depressed might believe the job promotion to be caused by luck (external), only because they are good at their job but nothing else (specific), and probably won't last long (unstable).

Beck's cognitive triad examines the explanations people make about themselves, their future, and their world. When something happens, someone can decide that it was either caused by them or caused by an external factor (internal/external), generalize the event to all events or keep it specific to the event at hand (global / specific), and decide whether he or she thinks it will continue in the future or will end soon (stable/unstable). If someone is depressed and they lose their job (or something else bad happens), they are likely to assume it's their fault (internal), it characterizes the fact that they can't do anything right (global), and their luck will not change (stable). 

Genetics, low serotonin, learned helplessness, and the cognitive triad are all hypothesized to be contributing factors to depression; however, excess levels of dopamine contribute to schizophrenia, not depression.

Learned helplessness is the idea that a person has learned from past experiences that they cannot control parts of their life, which can contribute to depression. Beck's cognitive triad examines the explanations people make about themselves, their future, and their world. When something happens, someone can decide that it was either caused by them or caused by an external factor (internal/external), generalize the event to all events or keep it specific to the event at hand (global / specific), and decide whether he or she thinks it will continue in the future or will end soon (stable/unstable). When someone is depressed, they tend to believe that good events are external, specific, and unstable, while bad events are internal, global, and stable.