The triad of nuclei that is isotonic is

  • A
    $^{14}_{6}C, ^{15}_{7}N, ^{17}_{9}F$
  • B
    $^{12}_{6}C, ^{14}_{7}N, ^{19}_{9}F$
  • C
    $^{14}_{6}C, ^{14}_{7}N, ^{17}_{9}F$
  • D
    $^{14}_{6}C, ^{14}_{7}N, ^{19}_{9}F$

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