Let $N$ be the set of natural numbers. For $n \in N$,define $I_n = \int_0^\pi \frac{x \sin^{2n}(x)}{\sin^{2n}(x) + \cos^{2n}(x)} dx$. Then,for $m, n \in N$,which of the following is true?

  • A
    $I_m < I_n$ for all $m < n$
  • B
    $I_m > I_n$ for all $m < n$
  • C
    $I_m = I_n$ for all $m \neq n$
  • D
    $I_m < I_n$ for some $m < n$ and $I_m > I_n$ for some $m < n$

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