**Quote:**

I am not sure about answer B

B states that atleast one number in set A is even.

Consider following two possibilities for A

A={-16,-3,-,-17) this set has at least one even negative number, however it may not be the greatest. another possibility (A={-2,-3,-1} we get two answers. Hence insufficient.

Statement A states that set is a set of prime numbers multuplied by -1

so A={-2,-3,-7,....} or A={-3,-4,-5} hence insufficient.

Combine the two, we get answer -2 as the only even prime number is 2.

Hence the answer is C

Please correct if I am wrong.

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Best wishes

Chetan