According to B.F. Skinner, a behavior that is no longer followed by a reinforcing stimulus will:

A. become more difficult to manage
B. be missed by the organism
C. continue
D. become extinct

D. become extinct

D. become extinct

According to B.F. Skinner's operant conditioning theory, if a behavior is no longer followed by a reinforcing stimulus, it will eventually become extinct. This means that the behavior will decrease in frequency and eventually stop occurring altogether.

To find the answer to this question, we need to understand the work of B.F. Skinner and his principles of behaviorism. B.F. Skinner was a psychologist who focused on the study of behavior and how it is influenced by environmental consequences.

According to Skinner's principles, behavior that is no longer followed by a reinforcing stimulus will eventually become extinct. This means that if a behavior does not lead to a desirable outcome or reinforcement, it will gradually decrease and stop occurring.

The correct answer to the question is option D: become extinct.