The learning process studied in the Skinner box is known as:

A) social learning.
B) higher-order conditioning.
C) cognitive learning.
D) operant conditioning.

The learning process studied in the Skinner box refers to operant conditioning, which is a form of learning in which behavior is modified by its consequences through reinforcement or punishment. In this context, Skinner demonstrated how animals (and humans) could learn to associate a behavior with a consequence by manipulating the rewards and punishments in their environment.