The correct answer based on the context of Margee Kerr's study about fear would be:
A. People who are scared by an experience are in a better mood after being scared.
This option aligns with the idea that experiencing fear in a controlled environment can lead to positive emotional outcomes, such as increased happiness and mood improvement after the experience. This is consistent with the psychological benefits derived from engaging with fear in a fun or thrilling context, such as amusement parks or horror movies.