Which of the Following Shows the Correct Expression for the Ionization

Which of the following shows the correct expression for the ionization energy indicated?

A) IE₃: Al(g) $\to$ Al³⁺(g) + 3e^-
B) IE₁: Cl(g) $\to$ Cl⁺(g) + e^-
C) IE₂: Mg(g) $\to$ Mg²⁺(g) + 2e^-
D) IE₁: Na(s) $\to$ Na⁺(g) + e^-
E) IE₃: O₂(g) $\to$ O₂⁺(g) + e^-