In What Health Context Might Positive Messages Be Much Better

In what health context might positive messages be much better than fear-inducing messages for effecting behavior change?

A) When health officials want to get children to see the school nurse
B) When males are worried about painful examinations or tests
C) When the message's health concern is not serious and does not involve a prescription
D) When the message's health concern is very serious or fatal
E) When the source is actually a physician