Which of the following are pairs of isotopes?

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(D) Isotopes are defined as atoms of the same element that have the same atomic number $(Z)$ but different mass numbers $(A)$.In option $(a)$,both spe

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Both $(a)$ and $(c)$

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(D) Isotopes are defined as atoms of the same element that have the same atomic number $(Z)$ but different mass numbers $(A)$.In option $(a)$,both species have an atomic number of $1$ (Hydrogen),making them isotopes.In option $(c)$,both species have an atomic number of $2$ (Helium),making them isotopes.Therefore,both $(a)$ and $(c)$ represent pairs of isotopes.

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