If $x = \sin(t)$, $y = \cos(pt)$, then $(1 - x^2) \frac{d^2y}{dx^2} - x \frac{dy}{dx} = $

  • A
    $-p^2y$
  • B
    $p^2y$
  • C
    $-py$
  • D
    $py$

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