During Music Class,Lisa Enthusiastically Sings Aloud with Her Class,but the Teacher

During music class,Lisa enthusiastically sings aloud with her class,but the teacher comments,"Lisa,please...you sound like an owl in a torture chamber." Lisa turns bright red.The next week she feels ill when it is time to go to music class again.Feeling anxiety at the prospect of going to music class is an example of

A) an unconditioned stimulus.
B) classical conditioning.
C) cognitive learning.
D) social learning.