If $x \sin^3 \alpha + y \cos^3 \alpha = \sin \alpha \cos \alpha$ and $x \sin \alpha - y \cos \alpha = 0$,then $x^2 + y^2 = $

  • A
    $-1$
  • B
    $1$
  • C
    $0$
  • D
    None of these

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