Answer:
(c). bipolar disorder.
Explanation:
Manic-depressive disorder or bipolar disorder is a neurological disorder, characterized by unusual shifts in activity levels, mood, energy levels, and ability to perform daily life activities.
People affected with bipolar disorder experience depressive low episodes to manic high episodes. Depressive episodes are characterized by decreased energy and activity level, depression and thinking about death, while manic episodes are characterized by high energy and activity level and think about to do risky or worthless things.
Thus, the correct answer is option (c).
