$\int_{-2 \pi}^{2 \pi} \sin ^4 x \cos ^6 x d x=$

• A

  $\frac{3 \pi}{128}$
• B

  $\frac{9 \pi}{32}$
• C

  $\frac{9 \pi}{64}$
• Correct answer
  D

  $\frac{3 \pi}{64}$

Hence, the correct answer is option: 'D'.