If a Carbon Atom Combines with Oxygen Atoms to Form

If a carbon atom combines with oxygen atoms to form CO₂,this would be described as ____.​

A) ​a physical change
B) ​a chemical change
C) ​both a physical and chemical change
D) ​first a physical change,but then it becomes a chemical change
E) ​neither a physical change or a chemical change,but a scientific change