Answer:
The introduction of a pleasant stimulus is to reinforcement as the withdrawal of a pleasant stimulus is to punishment. This is because, a stimulus which helps to encorage an action towards actualising a given set objective varies.
When a plesant stimulus is introduced, it tends to reinforce the believe that the desired outcome is what is expected to achieve whereas when the withdrawal of plesant stimulus tends to create the impression that, the desired result is no longer needed though to an action that might have happened. This serves as a punishment.
Step-by-step explanation: