Answer:
D) bipolar disorder
Explanation:
Bipolar disorder: Bipolar disorder is also referred to as manic-depressive illness. The bipolar disorder is one of the brain disorders that leads to abnormal shifts in energy, activity levels, mood, and day-to-day capability of doing a particular task. Bipolar disorder is of four types.
In other words, bipolar disorder is a form of mental illness described as having extreme mood swings ranging from low to high to low, and high to low. High mood swings lead to develop periods of mania, whereas low mood swings lead to develop periods of depression.
Cause:
1. Hormonal problems.
2. Environmental factors.