Answer:
d. The overjustification effects
Explanation:
Overjustification effect is a psychological phenomenon where an external incentive that is expected to motivate an individual actually reduces his intrinsic motivation to perform well.
The extrinsic motivation recieved now replaces the intrinsic motivation for the person. That is they don't focus anymore on performing well in the task. They rather enjoy the reward.
In the given scenario Students who enjoyed solving a puzzle were rewarded for doing so. Later, they played less with the puzzle than did their counterparts who were not rewarded for the same task.
The students lost motivation after being rewarded.
