`F` has the highest electronegativity among the group `17` elements (i.e. `ns^(2) np^(2) np^(5)` type), on the Pailing scale, but the `EA` of `F` is less than that of `Cl` because
A. `F` being the first member of the family behaves in an unusual manner.
B. The atomic number of `F` is less than that of `Cl`.
C. `Cl` can accommodate an electron better than `F` by utilsing its vacant `3d` orbital.
D. Small size, high `EN` and an increased electron-electron replusion makes addition of an electron to `F` less favourable.
