A

\[\frac{m}{\sqrt{n(2m+n)}}\]

B

\[\frac{n}{\sqrt{m(2m+n)}}\]

C

\[\sqrt{\frac{2m+n}{2n+m}}\]

D

\[\sqrt{\frac{2m+m}{2n+n}}\]

E

\[\frac{n}{\sqrt{m(2m-n)}}\]