Answer:
organizing the books
Explanation:
Compulsion: In abnormal psychology, the term compulsion is referred to as an individual's rule-based, repetitive behavior for which he or she feels the need to perform because of the reason to feel normal and avoid negative consequences to occur. An individual experiencing compulsion feels to repeatedly perform a task even if he or she feels that the act or task isn't rational.
In the question above, the compulsion is organizing the books.