Factor the Greatest Common Factor from the Polynomial $15 x y + 21 x z - 6 x w$

Multiple Choice

Factor the greatest common factor from the polynomial. Assume any variable exponents represent whole numbers.
- $15 x y + 21 x z - 6 x w$

A) $3 ( 5 x y + 7 x z - 2 x w )$
B) $x ( 15 y + 21 z - 6 w )$
C) $3 x ( 5 y + 7 z - 2 w )$
D) $x ( 15 x y + 21 x z - 6 x w )$