Which system of equations has infinitely many solutions?
O A. 3y = -5x + 7
3x = -5y - 7
B. 3y = x - 4
3x - 9y = -12
C. 2x + y = 2
-4x - 2y = 4
OD. 2y = 3x + 6
4y = 6x + 12
