Evaluate the integral ${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}4\frac{x}{\sqrt[\phantom{2}]{9-x^2}}dx$

Select one:

a$.-12\sqrt[\phantom{2}]{9-x^2}C$

b$.4\sqrt[\phantom{2}]{9-x^2}C$

c$.-4\sqrt[\phantom{2}]{9-x^2}C$

d$.12\sqrt[\phantom{2}]{9-x^2}C$