$\triangle ABC$ માં,જો $4r_1 = 5r_2 = 6r_3$ હોય,તો $\sin^2 \frac{A}{2} + \sin^2 \frac{B}{2} + \sin^2 \frac{C}{2} =$

  • A
    $\frac{19}{22}$
  • B
    $\frac{25}{33}$
  • C
    $\frac{74}{99}$
  • D
    $\frac{28}{33}$

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