Evaluate the integral ${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x}{\sqrt[\phantom{2}]{x+2}}dx$

Determine a change of variables from $x$ to $u.$ Choose the correct answer below.

A$.u=x-2$

B$.u=x+2$

C$.u=\sqrt[\phantom{2}]{x+2}$

D$.u=\sqrt[\phantom{2}]{x}$