A Major Concern with Using Self-Help Books Rather Than Seeking

A major concern with using self-help books rather than seeking out professional guidance and assistance is that

A) self-help authors are just writing them to make money rather than help people.
B) few clinicians would ever recommend such materials to their clients.
C) self-help books tend to challenge conventional wisdom and are more effective than seeing a psychiatrist or clinical psychologist.
D) the claims made in most self-help books have never been scientifically tested.