IMAT 2021 Redox Q45

I couldn’t understand here why C is not the answer since Cl exists as a Cl2 not simply Cl? What am I missing? Thanks

Correct answer here is A


The first electron affinity is the energy released when 1 MOLE of gaseous ATOM each acquire an electron to form 1 mole of gaseous 1- ions, so the answer has to be A) instead of C)

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