Answer:
b. obsessive-compulsive disorder.
Step-by-step explanation:
Obsessive-compulsive disorder: In psychology, the term "obsessive-compulsive disorder" is also written as "OCD", and is referred to as a mental disorder in which an individual generally feels the requirement to perform a few specific routines repeatedly denoted as "compulsions" or carry out a few specific thoughts repeatedly denoted as an obsession. Who so ever is dealing with this, feels unable to control his or her activities or thoughts for a longer period.
In the question above, Howie Mandel suffers from obsessive-compulsive disorder.