If n and k are integers whose product is 1600, which of the following statements must be true? Choose the correct choice from the following answers
A) n+k>0  B) n does not equal k  C) Either n or k is a multiple of 10  D) If n is even, then k is odd  E) If n is odd, then k is even
If n is odd and k is odd, then the product is odd.   The answer is If n is odd, then k is even.
<result>E</result>
If n and k are integers whose product is 1600, which of the following statements must be true?