Which of the Following Is a Problem or Limitation That

Multiple Choice

Which of the following is a problem or limitation that Steve Salerno noticed about self-help treatments when he worked for a publisher of self-help materials?

A) Most, but not all of the treatments, have been adequately tested in good studies.
B) Some of the treatments have been found to be ineffective in scientific studies.
C) The same people tend to repeatedly buy new self-help books.
D) The treatments may help a person at first, but then lose their effectiveness.