Which statement about tragedy is true?
a. tragedy makes people laugh and teaches them a lesson.
b. tragedy exposes negative emotions and fears.
c. tragedy begins sad but ends happy.
d. tragedy always ends well.

The only correct option here is B. tragedy exposes negative emotions and fears. A is incorrect because this refers to comedy, not tragedy. C is incorrect because tragedies are usually sad throughout - there isn't much happiness there. D is incorrect because it almost never ends well. This leaves us with B as the correct option, given that tragedies are usually quite dreary and sad, with a lot of negativity.