How is a comedy different from a tragedy?

A. In a comedy the story is short and the dialogue easily understood, while in a tragedy the audience is often confused by the dialogue and order of events.
B. In a comedy the events are historically accurate and true, while in a tragedy both the characters and events are entirely made up.
C. In a comedy the characters speak to the audience to explain their feelings, while in a tragedy the characters don't reveal their inner thoughts.
D. In a comedy the main character has problems that are funny and not serious, while in a tragedy the protagonist has bad luck and suffers pain and loss.