Which of the Following Best Supports the Idea That Obsessive-Compulsive

Which of the following best supports the idea that obsessive-compulsive disorder is related to operant conditioning?

A) Tom's brother never locks doors, so he checks the locks compulsively to be as different as possible from his brother.
B) Tom sees his mother compulsively check the door locks, so he also engages in the same behavior.
C) Tom experiences relief whenever he checks the locks, so he checks the locks whenever he is anxious.
D) Tom believes that checking the lock compulsively will keep his family safe.