Atherapist may use to john identify rewards that may be encouraging his negative behavior. the goal of the therapy is to change john's behavior for the better.

The correct answer is applied behaviour analysis.
Applied behaviour analysis (ABA) is a scientific discipline which uses techniques based on the principles of learning to change behaviors that are socially unacceptable and probably deviant. ABA studies first the connection between the targeted behaviour and the environment and then tries to cultivate socially acceptable behaviours that will replace the negative/unwanted behaviour. 

Ithink it would be choices a and b. hope this !