A Girl Learns That Whenever Her Brother Shares His Cookie

A girl learns that whenever her brother shares his cookie with her, her mother gives him a piece of candy. The girl starts sharing her treats with her friends when they come over in the hopes of getting a similar reward. The girl's learning to share is an example of

A) classical conditioning
B) operant conditioning
C) contingency theor.
D) observational learnin.
E) insight learning