A student solved this problem and said the answer was 8 1/4 feet. Jenny had three pieces of rope. One piece was 3 1/2 ft long, another was 2 1/4 ft long, and the third piece was 2 1/2 ft long. How much rope did Jenny have in all? Is the student's answer reasonable?

A. Yes, the answer is reasonable.

B. No, the answer is not reasonable. It should be about 2 feet.

C. No, the answer is not reasonable. It should be about 5 feet.

D. No, the answer is not reasonable. It should be about 15 feet.