Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers thequestion.
- $\left(x^{4} y^{9}\right) ^{3}$

A) $x^{64} y^{ 729}$
B) $x^{7} y^{12}$
C) $x^{4} y ^{27}$
D) $x^{12} y^{27}$