Final answer:
If a behavior undergoing extinction is accidentally reinforced, it becomes more likely to occur because the accidental reinforcement suggests to the organism that the behavior is still effective in obtaining a reward.
Step-by-step explanation:
During the process of operant conditioning, when a behavior that is undergoing extinction is accidentally reinforced, the likelihood of that behavior occurring again increases. This is because the reinforcement serves as a signal to the organism that the behavior is still effective in obtaining a reward or positive outcome, thus counteracting the extinction process which aims to reduce the behavior by withholding the reinforcement that originally encouraged it.
For instance, if a student is trying to stop snacking while studying by not allowing themselves a treat after each session, but one day they give in and have a snack, this accidental reinforcement may make it more likely that they will continue to snack while studying in the future. The correct answer to what happens to a behavior when it is accidentally reinforced during the extinction process is A) It becomes more likely to occur.