What Would a Behavior Therapist Tell a Snake-Phobic Client Using

What would a behavior therapist tell a snake-phobic client using systematic desensitization to do if he or she were to begin experiencing anxiety while visualizing a snake through the window?

A) Continue the process by increasing his coping thoughts.
B) Continue the process by decreasing his distress-maintaining thoughts.
C) Repeat his relaxation technique until his anxiety diminishes.
D) Stop the visualization for the rest of this session.