Aluminum is a highly reactive metal that oxidizes when exposed to air. Which of these would be a good first step in balancing this reaction? Al + O2 → Al2O3 A) Put a coefficient of 3 on Al B) Put a

Aluminum is a highly reactive metal that oxidizes when exposed to air. Which of these would be a good first step in balancing this reaction? Al + O2 → Al2O3 A) Put a coefficient of 3 on Al B) Put a coefficient of 3 on O2 C) Put a coefficient of 2 on O2 D) Put a coefficient of 3 on Al2O3