The harmonic mean of $3, 7, 8, 10, 14$ is

  • A
    $\frac{3 + 7 + 8 + 10 + 14}{5}$
  • B
    $\frac{1}{3} + \frac{1}{7} + \frac{1}{8} + \frac{1}{10} + \frac{1}{14}$
  • C
    $\frac{\frac{1}{3} + \frac{1}{7} + \frac{1}{8} + \frac{1}{10} + \frac{1}{14}}{4}$
  • D
    $\frac{5}{\frac{1}{3} + \frac{1}{7} + \frac{1}{8} + \frac{1}{10} + \frac{1}{14}}$

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