Which of the following is correct?
- A$^1_1 H$ and $^3_2 He$ are isotopes
- B$^{14}_6 C$ and $^{14}_7 N$ are isotopes
- C$^{39}_{19} K$ and $^{40}_{20} Ca$ are isotones
- D$^{19}_9 F$ and $^{24}_{11} Na$ are isotopes
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