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

Note: There is only one answer.