If $\operatorname{cosec} \theta$ and $\cot \theta$ are the roots of $cx^2+bx+a=0$ $(bc \neq 0)$,then $b^2(b^2-4ac)=$

  • A
    $-2c^4$
  • B
    $2c^4$
  • C
    $-c^4$
  • D
    $c^4$

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