According to the law of effect, in which scenario is the behavior likely to be repeated as a result of the reward? teacher returns grades on final exam one week after the students took the exam. student receives a piece of candy after answering a question correctly in class. student receives excellent results to high-stakes tests in the mail over the summer. student's coach praises his sportsmanship at the end of the season.

its b.)Student receives a piece of candy after answering a question correctly in class. since the student is being rewarded in return for a correct answer, so the student will proceed to try to answer correctly to get the candy; a stimulus response. though the last sentence might be right, it doesn't grant a reward, only verbally, it serves as motivation and pride, but not a reward. the other two are unrelated to the law of effect so they aren't an option to consider. 

-hope it helps!