Danny's Babysitter Kept Promising to Bring Him a Special Treat

Danny's babysitter kept promising to bring him a special treat when she came to see him again. She had done this on several previous occasions but never actually brought a treat with her, although she had promised to. Danny's disappointment

A) will increase his apparent level of self-control.
B) will decrease his apparent level of self-control.
C) will not affect his apparent level of self-control.
D) will affect his actual level of self-control.