In a $\triangle ABC$,if $b=2, c=3$ and $\angle B=\frac{\pi}{6}$,then $a$ satisfies the equation

  • A
    $a^2+3 \sqrt{3} a+5=0$
  • B
    $a^2+3 \sqrt{3} a-5=0$
  • C
    $a^2-3 \sqrt{3} a+5=0$
  • D
    $\sqrt{3} a^2+3 a+5=0$

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