Which of the following species has the highest electron affinity?

Given below are two statements:
Statement $I$: Fluorine has most negative electron gain enthalpy in its group.
Statement $II$: Oxygen has least negative electron gain enthalpy in its group.
In the light of the above statements,choose the most appropriate from the options given below.

The amount of energy released due to the addition of an extra electron to the outermost orbit of a gaseous atom is called:

Which one of the elements has the maximum electron affinity?

Which of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) for the given elements?

The order of electron affinity for $F, Cl, Br,$ and $I$ is .....