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ascenj42481
it is between c 12 and d 13
12 cartons will be 15 
and 13 will be 16.3
The Answer is C because of there are 12 inches in a foot and and 12 divided by 3 is 4, that means 4 cartons take up 5 feet. 8 cartons take up 10 ft. 12 Cartons take up 15 feet. Assuming you can't cut 3 inches off a carton, the answer is C. 12