In $\triangle ABC$,with usual notations,if $b=3$,$c=8$,and $m\angle A=60^{\circ}$,then the circumradius of the triangle is . . . . . . units.

  • A
    $\frac{7}{3}$
  • B
    $\frac{7\sqrt{2}}{3}$
  • C
    $\frac{7}{\sqrt{3}}$
  • D
    $\frac{7\sqrt{3}}{2}$

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