Answer:
D. The paid group would not work as long on the puzzle and like it less than the unpaid group.
Explanation:
Intrinsic motivation is the motivation a person gets from oneself. Whereas, extrinsic motivation is the result of some external factor. If the external factor is removed then the person is not motivated. In the intrinsic motivation the reward of the work is not the main goal but doing the work is the reward itself.
Hence, the group which was paid would not work as long on the puzzle and like it less than the unpaid group.