Wanda's Weight Loss Counsellor Has Observed That She Has a Self-Defeating

Wanda's weight loss counsellor has observed that she has a self-defeating pattern of beliefs and cognitions about her ability to control her overeating. Specifically, when she eats something that is not allowed on her diet, she thinks "I have no willpower; I'll always be fat" and continues to binge. Wanda's counsellor now is encouraging her to think "Well, I slipped on my diet at lunch. Relax, one slip isn't that bad. I'll get back on my diet right away!" The therapist is utilizing a technique called

A) theory of reasoned behaviour.
B) positive reinforcement.
C) self-punishment.
D) cognitive restructuring.
E) self-monitoring.