If $A = 30^\circ, c = 7\sqrt{3}$ and $C = 90^\circ$ in $\Delta ABC$,then $a = $

  • A
    $7\sqrt{3}$
  • B
    $\frac{7\sqrt{3}}{2}$
  • C
    $\frac{7}{2}$
  • D
    None of these

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