Given a chemical reaction, methane (CH₄) burns in oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). Which of these represent an unbalanced equation with the correct chemical formulas?

A. CH₄ + O₂CO₂ + H₂O.
B. CH₄+ CO₂O₂ + H₂O
C. CO₂+ H₂O CH₄+ O₂
D. CH₄O2 + CO₂+ H₂O