Simplify the following expression.
7x - 4y + 5z - 2x - 10y + z
A5x - 14y + 6z
B9x - 14y + 6z
C5x - 6y + 6z
D9x - 6y + 6z
7x - 4y + 5z - 2x - 10y + z
A5x - 14y + 6z
B9x - 14y + 6z
C5x - 6y + 6z
D9x - 6y + 6z