it's A.
Take the first statement...since -M equals to absolute value,
then M must be negative for -M to be positive. So the first statement is sufficient.
Consider the second statement, M can be 3 or -3 so, this one is not sufficient.
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Statement 1 is almost sufficient, but not quite: M can be negative (as explained in the post above), as required, or M can be 0. We need Statement 2 to ensure that M is not zero, so the answer is C.
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