(A) If a number x is not odd, then x is not a prime number.
If a number x is odd, then it is a prime number.
(B) If a number x is not odd, then x is a prime number.
If a number x is odd, then it is a prime number.
(C) If a number x is not odd, then x is not a prime number.
If a number x is odd, then it is not a prime number.
(D) If a number x is not odd, then it is not a prime number.
If a number x is odd, then it is not a prime number.