From the Rescorla-Wagner Perspective, the Best Way to Extinguish the Fears

From the Rescorla-Wagner perspective, the best way to extinguish the fears of a person who is afraid of both snakes and spiders would be to

A) teach the person to relax and then present spiders while he maintains the relaxed state. Once the fear of spiders is extinguished, perform the same procedure with snakes.
B) teach the person to relax and then present both spiders and snakes while he maintains the relaxed state.
C) have the person interact with spiders, and then repeat this procedure with the snakes.
D) have the person interact with spiders and snakes together.