The product of two numbers is 21. If the first number is -3, which equation represents this situation and what is the second number?
A. The equation that represents this situation is x − 3 = 21. The second number is 24.
B. The equation that represents this situation is 3x = 21. The second number is 7.
C.The equation that represents this situation is -3x = 21. The second number is -7.
D.The equation that represents this situation is -3 + x = 21. The second number is 18.