C because 15 over 5 is equal to 15 five times and in C it is shown only 4 times so 15 over 5 <15 over 4. (C)
I believe it's C because 15 with an exponent of 5 is 15 x 15 x 15 x 15 x 15.
So that's basically larger than 15 x 15 x 15 x 15.
Common sense.
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