The Change in Energy for Which of the Following Processes

The change in energy for which of the following processes represents the first ionization energy of iodine?

A) I(g) → I²⁺(g) + 2e^-
B) I(g) + e ^- → I^-(g)
C) 2I^-(g) → I₂(s) + 2e^-
D) I(g) → I⁺(g) + e^-
E) I^-(g) → I⁺(g) + 2e^-