Which of the following pairs is an example of isotones?

  • A
    ${ }_{6}^{12}C ; { }_{6}^{14}C$
  • B
    ${ }_{6}^{12}C ; { }_{5}^{11}B$
  • C
    ${ }_{6}^{14}C ; { }_{7}^{14}N$
  • D
    ${ }_{6}^{13}C ; { }_{5}^{11}B$

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