Question

strengthening of a response through the introduction of a stimulus after the response occurs
positive reinforcement
insight learning
secondary reinforcer
programmed instruction
avoidance learning

Explanation:

Positive reinforcement is the addition of a stimulus after a behavior occurs to increase the likelihood of that behavior being repeated. Insight learning involves sudden understanding, a secondary reinforcer is a learned reinforcer, programmed - instruction is a teaching method, and avoidance learning is about learning to avoid a negative stimulus.

Answer:

A. positive reinforcement