GKFix MCQ Question

Which of the following is an example of a combustion reaction?

• A. CaCO₃(s) → CaO(s) + CO₂(g)
• B. 2NaH(s) → 2Na(s) + H₂(g)
• C. Mg₃N₂(s) → 3Mg(s) + N₂(g)
• D. C(s) + O₂(g) → CO₂(g)