If $\sin 2\theta$ and $\cos 2\theta$ are solutions of $x^2 + ax - c = 0$,then

  • A
    $a^2 - 2c - 1 = 0$
  • B
    $a^2 + 2c - 1 = 0$
  • C
    $a^2 + 2c + 1 = 0$
  • D
    $a^2 - 2c + 1 = 0$

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