Which system of equations is equivalent to the system of equations shown?
x - 6y = 3
4x - 8y = 4

A) 5x - 14y = 7 and 6x - 12y = 6
B) 5x + 14y = 7 and 6x - 12y = -6
C) 5x - 14y = 7 and 6x + 12y = 6
D) 5x - 14y = 7 and 6x - 12y = -6