Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Simplify the complex fraction
- $\frac{\frac{x}{5}}{\frac{9}{x+7}}$

A) $\frac{x+7}{45 x}$

B) $\frac{9 x}{5(x+7) }$

C) $45 x(x+7)$

D) $\frac{x(x+7) }{45}$