Felix needs to find x and y in the following system:
Equation A: 7y - 4x = 5
Equation B: 3y + 4x = 25
If he wants to use the elimination method to eliminate one of the variables, which is the most efficient way for him to do so?

A. Add Equation A and Equation B

B. Subtract Equation B from Equation A

C. Multiply Equation A by 5.

D. Divide Equation B by -1.