To Joke with His Coworkers, Richard Likes to Pretend to Trip

To joke with his coworkers, Richard likes to pretend to trip when walking down the hallway at work. However, the last time that he tripped, he actually fell right on his chin. It was hard for Jackie and the rest of the office not to laugh at him. Trying not to laugh when a coworker trips is an example of what type of emotional regulation?

A) reappraisal
B) attention deployment
C) suppression
D) cognitive change