Alex Has Learned That If His Mom Is Upset and He

Multiple Choice

Alex has learned that if his mom is upset and he praises her,she will cook him a great meal.However,if he praises his mom when she is in a good mood,she responds by saying,"Are you trying to butter me up?" and doesn't cook at all.In this example,Alex's mom's mood is a ____.

A) discriminative conditioned stimulus
B) reinforcer
C) prohibitive control
D) stimulus predictor