Answer:
B) Cyclothymic disorder
Explanation:
Allan who works in the neighborhood hardware store, is suffering from mood swings. His mood swing ranges from dysphoria to hypomania.
Dysphoria is a state of dissatisfaction or distress in life. And hypomania is a state where mind remains restless and elevated. It is mentioned that his mood sometimes changes rapidly.
Thus he is suffering from Cyclothymic disorder. A person suffering from Cyclothymic disorder have severe mood disorder that causes highs and lows in emotions over time. It is type of bipolar disorder.
Thus the answer is B) Cyclothymic disorder.