What Is the Only Type of Extrinsic Reward That Did

Multiple Choice

What is the only type of extrinsic reward that did not improve average performance on test performance in studies on incentives and test performance?

A) Receiving a grade of A if they were among the top three students in their class.
B) Receiving a certificate for good performance.
C) Receiving a prize if they were one of the top three performers.
D) Receiving an A through F grade for their performance.