Obsessive–compulsive disorder (OCD) is amental disorder where people feel the need to check things repeatedly, perform certain routines repeatedly (called "rituals"), or havecertain thoughts repeatedly. People are unable to control either the thoughts or the activities for more than a short period of time.
Obsessive Compulsive Disorder (OCD) involves unwanted and disturbing thoughts, images, or urges (obsessions) that intrude into a child/teen’s mind and cause a great deal of anxiety or discomfort, which the child/teen then tries to reduce by engaging in repetitive behaviors or mental acts (compulsions).
Answer: C. to move around from one setting to another.
Explanation: When writting nonfiction, the author have to be well plotted such that such makes and give his writing more freedom in moving around form one setting to another.