Find an Equivalent Expression with the Given Denominator $\frac{4}{9 \mathrm{x}}=\frac{?}{9 \mathrm{xy}}$

Multiple Choice

Find an equivalent expression with the given denominator.
- $\frac{4}{9 \mathrm{x}}=\frac{?}{9 \mathrm{xy}}$

A) $\frac{4 x y}{9 x y}$
B) $\frac{y}{9 x y}$
C) $\frac{4 y}{9 x y}$
D) $\frac{36 y}{9 x y}$