A student solved this problem and said the answer was 2 cups.
Rhonda picked 6 cups of blackberries. Her sister picked 4 cups of blackberries. How many more cups of blackberries did Rhonda pick than her sister?
Is the student's answer reasonable?
A. Yes, the answer is reasonable.
B. No, the answer is not reasonable. It should be about cup.
C. No, the answer is not reasonable. It should be about 4 cups.
D. No, the answer is not reasonable. It should be about 10 cups.