Shaun Recently Began Cognitive Behavioral Therapy (CBT), Via Online Live

Shaun recently began cognitive behavioral therapy (CBT) , via online live video sessions with a therapist. Because you are familiar with the research on this approach, you would be likely to advise Shaun that

A) studies show that this method of communication is not effective.
B) online CBT therapy is just as effective as face-to-face therapy.
C) most online therapists are not certified.
D) this method of providing therapy is highly controversial and rarely used.