Identify the reason for the gradual change in electronegativity in halogens down the group.

[A] Electronegativity increases down the group due to decrease in atomic size

[B] Electronegativity decreases down the group due to decrease in tendency to lose electrons

[C] Electronegativity decreases down the group due to increase in atomic radius/ tendency to gain electron decreases

[D] Electronegativity increases down the group due to increase in forces of attractions between nucleus and valence electrons