Rationalize the Denominator $\frac { 4 } { \sqrt { x + h } - \sqrt { x } }$

Multiple Choice

Rationalize the denominator. Assume that all variables represent nonnegative numbers and that the denominator is not
zero.
- $\frac { 4 } { \sqrt { x + h } - \sqrt { x } }$

A) $\frac { 4 ( \sqrt { x + h } - \sqrt { x } ) } { h }$
B) $\frac { 4 \sqrt { h } } { h }$
C) $\frac { 4 \sqrt { x + h } + \sqrt { x } } { h }$
D) $\frac { 4 ( \sqrt { x + h } + \sqrt { x } ) } { h }$