Which of the following pairs represents isobars?

  • A
    $^3He_2$ and $^4He_2$
  • B
    $^{24}Mg_{12}$ and $^{25}Mg_{12}$
  • C
    $^{40}K_{19}$ and $^{40}Ca_{20}$
  • D
    $^{40}K_{19}$ and $^{39}K_{19}$

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