The Most Accurate Statement Regarding the Use of Self-Help Diet

The most accurate statement regarding the use of self-help diet books in the treatment of obesity is that

A) there is a moderate level of long-term effectiveness.
B) they are effective only when used in combination with physician counseling.
C) they are more effective than commercial self-help programs such as Jenny Craig.
D) some individuals may lose some weight in the short term but almost always regain that weight.