Which of the Following Is an Example of the Treatment

Which of the following is an example of the treatment technique for OCD called exposure and response prevention?

A) Carrie has an obsessive fear of contamination, which has led to compulsive hand-washing rituals. Her therapist is treating her by making her touch dirty laundry but not allowing her to wash for increasingly longer periods of time afterward.
B) Kerry has an obsessive fear of contamination, which has led to compulsive hand-washing rituals. Her therapist is treating her by forcing her to wash her hands repeatedly, even when she doesn't feel anxious.
C) Kelly has religious obsessions. She feels that if she doesn't read biblical passages every hour of the day, she will do something evil. Her therapist is treating her by having her attend religious services more frequently so that good thoughts will replace the bad ones.
D) Callie has a hoarding compulsion. She becomes anxious whenever she has to throw something away; she even keeps stuff that she doesn't need and will never use. Her therapist has arranged for all Callie's junk to be removed and discarded when she is away from home.