Subject: ScienceScenario : Have you observed the flame of the candle? Have you noticed three different colour shades in a flame? Do you wonder why there are different colour shades in the flame of the same candle? These are three different zones of flame. The image shows three zones of flame with their names.The innermost zone of flame is also known as the dark zone, the middle zone of flame is also known as the luminous zone and the outermost zone of flame is also known as the non-luminous zone. Wax candle vaporises during burning and so forms flame. Due to the combustion process of these wax vapours, all these three zones of flame have different colours. The table shows the combustion process in different zones of flame. Flame Zone Combustion Processinnermost no combustionmiddle partial combustionoutermost complete combustionQuestion:7 )  Which zone of the flame gets sufficient oxygen for combustion?A)   middle zoneB)    outermost zoneC)    Both the middle and outermost zoneD)    Both the innermost and middle zone