The correct increasing order of electron affinity value of atoms is:

Explanation

Electron affinity is defined as the change in energy of a neutral atom when an electron is added to the atom to form a negative ion. Electron affinity increases upward for the groups. All of the elements in the question belong to the same group (7) so electron affinity will decrease as we go down the group. Iodine has the lowest electron affinity because of its high atomic size and therefore has less tendency to accept electrons to form anion whereas Cl has the highest electron affinity because of less atomic size and has a high tendency to accept electrons. F exceptionally has low electron affinity than Cl but higher than Br because of the very small size of F there is repulsion between inner and outer electrons. This is the correct order of increasing electron affinity is: I<Br< F<Cl