Of the following elements, which one has the highest electronegativity?

Electronegativity increases going upwards within a group in the periodic table due to a decrease in atomic size and increased effective nuclear charge. Among the halogens presented—Fluorine ($\text{F}$), Chlorine ($\text{Cl}$), Bromine ($\text{Br}$), and Iodine ($\text{I}$)—Fluorine sits at the top of Group 17 and possesses the highest electronegativity value ($\approx 4.0$ on the Pauling scale) of all elements.