Takeshi Is Seeing Dr

Takeshi is seeing Dr. Shakar to help her deal with her social phobia. Early in treatment, they built a list of 15 steps beginning with low-anxiety scenarios and ending with high-anxiety scenarios. Over time they have conquered many of the situations on the list, and it is time for Takeshi to try staying relaxed while walking down a busy street. The approach Dr. Shakar is using with Takeshi is called

A) flooding.
B) free association.
C) rational-emotive therapy.
D) systematic desensitization.
E) sublimation.