Which of the following properties among halogens decreses (s)from fluorine to iodine?

Options

A. Equal in magnitude but opposite in sign to the electron gain enthalpy of the cation of the element
B. same as electron affinity of the element
C. energy required to remove one valence electron from an isolated gaseous atom in its ground state
D. Equal in magnitude but opposite in sign to the electron gain enthalpy of the anion of the eelment