Which of the following pairs represents isotones?

  • A
    ${ }_{1}H^{1}$ and ${ }_{2}He^{3}$
  • B
    ${ }_{6}C^{14}$ and ${ }_{7}N^{14}$
  • C
    ${ }_{19}K^{39}$ and ${ }_{20}Ca^{40}$
  • D
    ${ }_{9}F^{19}$ and ${ }_{11}Na^{24}$

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