A) \[\frac{m}{n}\]
B) \[{{\left( \frac{m}{n} \right)}^{2}}\]
C) \[{{\left( \frac{n}{m} \right)}^{2}}\]
D) \[{{\left( \frac{m}{m+n} \right)}^{2}}\]
Correct Answer: D
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