$\frac{2}{3}, \quad \frac{4}{7}, \quad ?, \quad \frac{11}{21}, \quad \frac{16}{31}$

  • A
    $\frac{5}{9}$
  • B
    $\frac{6}{11}$
  • C
    $\frac{7}{13}$
  • D
    $\frac{9}{17}$

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