40. Which of the following statements are true?
(A) E-book readers have become more and more expensive.
(B) The results of the survey emphasize the cultural and publishing changes.
(C) In the U. S., people who read e-books outnumber those who read printed books.
(D) It is estimated that by 2016, more than half of Americans will own an e-book reader.
(E) The fact that people give e-book readers as gifts contributes to the popularity of e-books.