Question

current attempt in progress
when you drink caffeine, you feel more energized and are happier with your productivity at work. you choose to drink caffeine more often after you realize the impact it has on your work. this is an example of
positive reinforcement.
negative reinforcement.
negative punishment.
positive punishment.

Explanation:

Positive reinforcement involves adding a pleasant stimulus (feeling energized and happy with productivity) to increase a behavior (drinking caffeine more often). Negative reinforcement removes an aversive stimulus, negative punishment removes a pleasant stimulus, and positive punishment adds an aversive stimulus. None of these fit as well as positive reinforcement.

Answer:

positive reinforcement.