in which states does wax act as the fuel in a burning candle? (urgent)?

The melted wax is drawn up through the wick, where it vaporises. This allows better contact with oxygen, so it will burn.

To light a candle, you have to hold the flame to the wick for a while. This is to get a steady stream of vaporised wax flowing so ignition can take place. Once that happened, the wax will continue to vaporise and burn. You can't see the vapour.

Flames are caused by burning vapors.