Which of the following statements about "Life Without Gravity" explains why it is an expository essay?
A) It describes the negative effects of weightlessness before it describes the positive effects
B) It is a short work of nonfiction that explains a set of processes
C) It uses an informal tone to convey factual information
D) It uses real-life examples to explain the main points
(Anyone know the answer? I'm horrible at ELA)