The correct order of electron affinity is

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(D) The electron affinity (or electron gain enthalpy) generally increases (becomes more negative) across a period and decreases down a group. However,

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$Cl > F > O$

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(D) The electron affinity (or electron gain enthalpy) generally increases (becomes more negative) across a period and decreases down a group. However,due to the small size of the $F$ atom,the incoming electron experiences significant inter-electronic repulsion in the $2p$ subshell. In contrast,the $Cl$ atom has a larger $3p$ subshell,which reduces this repulsion,making the addition of an electron more favorable. Therefore,the magnitude of electron affinity follows the order $Cl > F > O$.

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