Identify the compulsion in the following example. demarco can't stop thinking about his book collection, which includes hundreds of first editions. he wants it to be in a particular order. he spends hours every day organizing his books alphabetically by author, then by color, then by size.

a. thinking about the order of the books all the time
b. thinking about the books all the time
c. having hundreds of first editions in his book collection
d. organizing the books

D. organizing the books  

Explanation:

Compulsion: The term compulsion refers to the repetitive behavior carried out by an individual to avoid or ignore distressing situations. An individual usually perform compulsion to get rid of the obsession leading situations.

Example: washing hands & checking a locked door repeatedly, and rearranging or arranging items in a particular order.

Treatment: Psychotherapy including exposure and response prevention, cognitive behavioral therapy, etc.