Final answer:
The individual is likely suffering from major depressive disorder, which is characterized by symptoms such as sleep disturbances, fatigue, loss of concentration, and feelings of despair. The correct answer is C. major depressive disorder.
Step-by-step explanation:
The individual experiencing sleep disturbances, fatigue, loss of concentration, appetite changes, despair, and hopelessness suffers from major depressive disorder. Major depression, also known as major depressive disorder (MDD), is characterized by a variety of symptoms including intense sadness and despair, mental slowing, loss of concentration, pessimistic worry, agitation, and self-depreciation.
In addition, physical changes such as weight changes, decreased libido, and disruption of hormonal circadian rhythms can also occur. Antidepressants are often used as part of the treatment for major depression. It is essential to differentiate major depression from normal grief, sadness, and bipolar disorder, which is characterized by dramatic shifts in energy and mood.