If the lengths of the sides of a triangle are $3, 5, 7$,then the largest angle of the triangle is

  • A
    $\frac{\pi}{2}$
  • B
    $\frac{5 \pi}{6}$
  • C
    $\frac{2 \pi}{3}$
  • D
    $\frac{3 \pi}{4}$

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