Answer: A. obsessive-compulsive disorder
Explanation: This type of mental disorder is characteristic of people in whom certain thoughts, ideas, feelings, etc. are constantly appearing again and again. These are unwanted thoughts, ideas, and feelings that drive them to do the same thing over and over again. Therefore people with this mental disorder are mostly focused on particular details, they do the same thing all the time, based on the overly perceived details that result from repeated thoughts, feelings, ideas.