The greatest electron affinity will be "Ar".
What is electron affinity?
The quantity of energy produced when an electron must be coupled to a neutral atom as well as a molecule in the gaseous state to create an anion has been known as the electron affinity of an atom and molecule.
What is the variation of electron affinity?
In the periodic table, electron affinity typically increases over a period although occasionally declines within a group. The generally increased nuclear charge up a group throughout a period provides the chemical explanation for differences in electron affinities across the periodic table.
Therefore, Ar will have a higher electron affinity.
So the correct answer will be option (D)
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