The process involving the maximum amount of energy is c)
The first electron affinity is the amount of energy released or absorbed when an electron is added to a neutral atom in the gaseous state.
As you might expect, the electron affinity becomes more negative from left to right across a row in the Periodic Table.
Thus, the order of first electron affinities is
The numbers are +7, -141, and—328 kJ/mol, respectively.
The second electron affinity is the energy required to add an electron to a
gaseous 1- ion.
You are forcing an electron into an already negative ion. It's not going to go in willingly!
Thus, for the second electron affinity of oxygen,
This is the maximum amount of energy absorbed or released.
Hence, the correct answer is c).