In which of the following pairs, electron gain enthalpies of constituent elements are nearly the...

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In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?
(I) \( \mathrm{Rb} \) and \( \mathrm{Cs} \)
(II) \( \mathrm{Na} \) and \( \mathrm{K} \)
(III) Ar and \( \mathrm{Kr} \)
(IV) I and At
Choose the correct answer from the options given below:
(a) (I) and (II) only
(b) (II) and (III) only
(c) (I) and (III) only
(d) (III) and (IV) only
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