One of the Drawbacks of Exposure and Response Prevention as a Therapy

One of the drawbacks of exposure and response prevention as a therapy is that it:

A) has a more than 50 percent relapse rate.
B) is less effective with clients with obsessions but no compulsions.
C) is less effective with clients who have both obsessions and compulsions.
D) does not result in more improvement in obsessive-compulsive clients than do other cognitive-behavioral therapies.