If $x \sin 45^\circ \cos^2 60^\circ = \frac{\tan^2 60^\circ \csc 30^\circ}{\sec 45^\circ \cot^2 30^\circ}$,then $x = $

  • A
    $2$
  • B
    $4$
  • C
    $8$
  • D
    $16$

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