GKFix MCQ Question

Why does the basic character of Group 15 hydrides (NH₃, PH₃, AsH₃, etc.) decrease down the group?

• A. The atomic size decreases.
• B. The electronegativity increases.
• C. The E-H bond strength decreases, making the lone pair on E less available for protonation.
• D. The ionization energy increases.