$\frac{3}{4} \left(1+\frac{1}{3}\right) \left(1+\frac{2}{3}\right) \left(1-\frac{2}{5}\right) \left(1+\frac{6}{7}\right) \left(1-\frac{12}{13}\right)$ is equal to

  • A
    $\frac{2}{13}$
  • B
    $\frac{1}{7}$
  • C
    $\frac{1}{6}$
  • D
    $\frac{1}{5}$

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