I say B

I) B is clearly going to be bigger as it is to the 16th power rather than the 12th power. Sorry this isnt a good explanation its just kind of intuitive.

II) The smaller of the 2 is A and its going to have less digits than B, so when you add them together it is still going to have less digits.

III) 15 times itself any number of times will always end in 5. 10 times itself any number of times will always end in 0. Added together, it will end in 5 and not be divisible by 10.

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