$\int_{0}^{\frac{\pi}{2}} \sqrt{\cos \theta} \cdot \sin^{3} \theta d \theta = . . . . . .$

  • A
    $-\frac{20}{21}$
  • B
    $-\frac{8}{21}$
  • C
    $\frac{20}{21}$
  • D
    $\frac{8}{21}$

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