Because Yuri was curious about human behavior, he enrolled in an introductory psychology course. George registered because he heard it was an easy course that would boost his grade-point average. In this instance, Yuri's behavior was a reflection of , whereasGeorge's behavior was a reflection of .
A.operant conditioning; classical conditioning
B.intrinsic motivation; extrinsic motivation
C.an unconditioned response; a conditioned response
D.a fixed-interval schedule; a variable-interval schedule

Intrinsic Motivation: It is defined as the process of executing a behavior or an action by an individual because he or she enjoys the activity. The individual gets the inspiration for acting himself or herself.

Example: A child plays the football match because he loves playing it rather than thinking to get an award after winning the match.

Extrinsic motivation: It is defined as the behavior of a person that is operated by external rewards, for example, fame, praise, money, and grades. In this case, the motivation originates from outside of the person.

Example: A person is doing a job because he is getting paid for the job.

The instance given in the question above, Yuri's behavior was a reflection of intrinsic motivation, whereas George's behavior was a reflection of extrinsic motivation.