Answer:
You can use the process of elimination to help you with this problem.
Explanation:
Like so:
We know A isn't correct because it's just a positive number. The answer has to be negative.
We know B isn't the right answer because ANEGATIVE NUMBER MULTIPLIED BY ANOTHER NEGATIVE NUMBER IS ALWAYS POSITIVE
We know that C isn't the answer a negative x a negative = positive.
D IS THE CORRECT ANSWER because a positive multiplied by a negative and vice-versa is always negative.