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Math·Advanced Math·Equivalent expressions

hard

Which expression is equivalent to $\frac{20{\pi }^2}{{\pi }^2-x^2}-\frac{20\pi }{x+\pi }$, where $x>\pi$?

A

$\frac{20\pi }{\pi -x}$

B

$\frac{20\pi x}{{\pi }^2-x^2}$

C

$\frac{20{\pi }^2-20\pi }{{\pi }^2-x^2}$

D

$\frac{20\pi -20}{(\pi -x^2)(x+1)}$