Write a Chain Rule Formula for the Following Derivative $\frac { \partial w } { \partial x }$

Multiple Choice

Write a chain rule formula for the following derivative.
- $\frac { \partial w } { \partial x }$ for $w = f ( p , q ) ; p = g ( x , y ) , q = h ( x , y )$

A) $\frac { \partial w } { \partial x } = \frac { \partial w } { \partial p } \frac { \partial p } { \partial x } + \frac { \partial w } { \partial q } \frac { \partial q } { \partial x }$
B) $\frac { \partial w } { \partial x } = \frac { \partial w } { \partial p } \frac { \partial p } { \partial x }$
C) $\frac { \partial w } { \partial x } = \frac { \partial w } { \partial x } \frac { \partial x } { \partial p } + \frac { \partial w } { \partial x } \frac { \partial x } { \partial q }$
D) $\frac { \partial w } { \partial x } = \frac { \partial w } { \partial p } + \frac { \partial w } { \partial q }$