Solve the system of equations.

4x+2y+7z=6
4x+4y+4z=8
3x+2y+5z=6

A. (x=-3, y=3, z=1)
B. (x=-2, y=2, z=4)
C. (x=-5, y=5, z=3)
D. (x=-4, y=4, z=2)