GKFix MCQ Question

What is the reaction for the second ionization enthalpy?

• A. X(g) → X⁺(g) + e⁻
• B. X⁺(g) → X²⁺(g) + e⁻
• C. X²⁺(g) → X³⁺(g) + e⁻
• D. X(g) → X²⁺(g) + 2e⁻