Initially I thought it is a clear A. But there is a trap here.

statement 1) says Each member of set P is the product of -1 and a prime number

that means it can be -2, -3,-5, -7,-11....... and so on....

now it is not certain how many of these numbers will be part of set. if -2 part of the set then -2 is the greatest number. but from statement A it is not certain.

statement 2) says at least one number of even. so it can be -2,-4,-6,-8.... and so on. now this statement alone can not solve the problem.

combining both the statement we get,-2 is the only prime number that is even.

So combining statement 1 and 2 we get the solution

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hey ya......