will give brainlyist please help
Select the correct answer. David is studying for his upcoming exams. Each day he studies for three hours. After a practice test, he realizes that he scored lower in English. So, he decides to spend one extra hour studying his English text. What is the marginal benefit that David might receive after investing one extra hour on English? A. one extra hour of sleeping B. extra time with his friends C. a higher grade in other subjects D. a higher grade on his English exam E. one extra hour studying other subjects