Two legs of a right triangle have length a, which is an integer. the hypotenuse of that right triangle is length c, which is also an integer

None of those are technically correct. 9.7 x 104 is actually 1,008.8, but if that answer was a choice, it would be that one. if you meant 9.7 times maybe a thousand or more or divided by 10 or more, than the answer choices would be correct, but other than that, they actually arent.