To solve this system of equations by elimination, what operation could be used to eliminate the y-variable and find the value of x?

2x − 4y = 6
−3x + 3y = 12

A) add 3 times the second equation to 4 times the first equation
B) add 4 times the second equation to 3 times the first equation
C) subtract 3 times the second equation from 4 times the first equation
D) subtract 4 times the second equation from 3 times the first equation