A Professor Cleans the Whiteboard Before Every Class

Multiple Choice

A professor cleans the whiteboard before every class. He goes over the board at least three times before he considers it to be clean enough. Recently he has been late starting class because he is cleaning the whiteboard more and more. He is preoccupied with thoughts that previous markings are dirty and will contaminate his notes. A psychotherapist would say that this professor's _________ are compulsive.

A) thoughts about previous markings contaminating his notes
B) thoughts about what he will teach in class
C) behaviours of cleaning the whiteboard
D) habits of starting the class late