When a candle is burned, the heat of the flame melts the wax near the wick. This liquid wax then moves up the wick, where the heat of the flame vaporizes the liquid wax molecules. These vaporized molecules react with oxygen from the air to form new compounds, releasing heat and light in the process. The main products of the combustion of candle wax are carbon dioxide (CO2) and water (H2O). Therefore, the correct answer is "carbon (IV) oxide and water."