Answer:
CO₂
Step-by-step explanation:
The product of the reaction is CO₂. 
 In a chemical reaction, the product is the substance usually found on the right hand side of the expression. 
 Reaction equation is given as; 
 C + O₂ → CO₂ 
In this reaction, C and O₂ are the reactants 
 CO₂ is the product of the reaction. 
- This reaction is called a combination reaction in which two species combines to give a product.