David Myers Has Identified Several Strategies for Increasing Happiness in One's

David Myers has identified several strategies for increasing happiness in one's life. One of these is to act happy. Why is this likely to be effective?

A) Sometimes our emotions follow our behaviors.
B) We are more likely to attract other happy people.
C) We are more likely to create a positive impression.
D) Nobody wants to be around a person who is grumpy.