In general, the properties that decrease and increase down a group in the periodic table, respectively, are

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Electronegativity and electron gain enthalpy

Electronegativity and atomic radius

Atomic radius and electronegativity

Electron gain enthalpy and electronegativity

answer is B.

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Detailed Solution

Electronegativity decreases as we go down the group and atomic radius increases as we go down the group.

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