单项选择题

Questions 14—16 are based on the following passage about books with suggestions on how to do things in the United States. You now have 15 seconds to read Questions 14—16。
Why are "How To" books in great demand in the United States

A.Because the rich do not always satisfy.
B.Because many people read books only for pleasure.
C.Because these books help Americans out of trouble.
D.Because the books meet the needs of different readers.