Which of the following pairs is an isobar?

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(D) Isobars are atoms of different chemical elements that have the same mass number $(A)$ but different atomic numbers $(Z)$.In option $A$,$_1H^1$ and

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$_{15}P^{30}$ and $_{14}Si^{30}$

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(D) Isobars are atoms of different chemical elements that have the same mass number $(A)$ but different atomic numbers $(Z)$.In option $A$,$_1H^1$ and $_1H^2$ have the same atomic number $(Z=1)$ but different mass numbers,so they are isotopes.In option $B$,$_1H^2$ and $_1H^3$ have the same atomic number $(Z=1)$ but different mass numbers,so they are isotopes.In option $C$,$_6C^{12}$ and $_6C^{13}$ have the same atomic number $(Z=6)$ but different mass numbers,so they are isotopes.In option $D$,$_{15}P^{30}$ and $_{14}Si^{30}$ have different atomic numbers ($Z=15$ and $Z=14$) but the same mass number $(A=30)$.Therefore,$_{15}P^{30}$ and $_{14}Si^{30}$ are isobars.

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