What are the conditions in all types of zones?

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The non-luminous zone is the hottest part of the candle flame.

The luminous zone is the moderately hot part of the candle flame.

The dark zone is the least hot part of the candle flame.

All of the above

answer is D.

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Detailed Solution

The conditions of zones are non-luminous zones containing the hottest part of a candle flame. Luminous zone is the moderately hot part and the dark zone is the least hot part of candle flame.
The flame is divided into three primary zones depending on the amount of air. The zones are coloured differently. It is the hottest section of the candle flame during combustion in a non-luminous zone. The zone of incomplete combustion is also moderately heated in the bright zone. Because there is insufficient oxygen, the wax vapours do not burn entirely. The area of no combustion is the coolest in a dark zone. It is the flame's most inward region. It protects the region around the wick from unburned vapours created by wax melting.

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