Find the Integral Using an Appropriate Trigonometric Substitution $\int \frac{x}{\sqrt{4-x^{2}}} d x$

Multiple Choice

Find the integral using an appropriate trigonometric substitution. $\int \frac{x}{\sqrt{4-x^{2}}} d x$

A) $-\sqrt{4-x^{2}}+C$
B) $\sqrt{2-x}+C$
C) $\sqrt{4-x^{2}}+C$
D) $-\sqrt{2-x}+C$