Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 33 to 36.
Books which give instructions on how to do things are very popular in theUnited Statestoday. Thousands of these How-to books are useful: In fact, there are about four thousand books with titles that begin with the words “How to”. One book, may tell you how to earn more money, another may tell you how to save or spend it, and another may explain how to give your money away.
Many How-to books give advice on careers. They tell you how to choose a career and how to succeed in it. If you fail, however, you can buy the book “How to Turn Failure into Success”. One of the most popular types of books is one that helps you with personal problems. Why have How-to books become so popular? Probably because life has become so complex. Today people have far more free time to use, more choices to make, and more problems to solve. How-to books help people deal with more life.
What does the word “They” in line 5 refer to?
A.money
B.advice
C.books
D.people