Answer:
b. depression
Step-by-step explanation:
Depression refers to a disorder that is usually characterized by a feeling of sadness or hopelessness and a loss of interest. Such apathy is longer and deeper than the normal fluctuations of mood that people experience in normal life. It is also different from grief, as depression often has no apparent reason to exist, nor does it go away after a certain period of time. Cognitive therapy has been shown to be effective with depression as it tries to change behaviours by influencing the patient's thought patterns.