Some students study hard beginning with the first couple of weeks of a semester because they subsequently receive very good final course grades. This best illustrates that human behavior is influenced by:

A. classical conditioning.

B. primary reinforcers.

C. latent learning.

D. delayed reinforcers.

The correct answer is letter D

Delayed reinforcement is a time delay between the desired response and the reward in the Operant Conditioning.

Operant conditioning (sometimes referred to as instrumental conditioning) is a method of learning that occurs through rewards and punishments for behavior. Through operant conditioning, an association is made between a behavior and a consequence for that behavior.