39. When Richard Zare says that scientists lead a “constant schizophrenic existence” (lines 34–35), he most nearly means that they:

  • A. often suffer psychologically from the demands of their work.

  • B. tend to be either complete cynics or people who believe too much.

  • C. are often guilty of either doing nothing or of fooling themselves.

  • D. have to maintain a balance between accepting and challenging ideas.