The step which is not reversible while burning a candle is/ are

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Melting of solid wax

Burning of wax vapour into flame

Changing of liquid wax into vapour

All of these

answer is B.

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Detailed Solution

The step which is not reversible while burning a candle is burning of wax vapour into flames.
The reversible changes can be reversed; that is, we get the substance back in its original form. The irreversible changes cannot be reversed, and we do not get the substance back in its original form. The melting of wax and the changing of liquid wax into vapour are reversible changes, and the wax that is the original substance can be obtained in its original form. The wax vapour which is being utilized or getting used up for burning can never be retained in its original form. So, burning of wax vapour into flame cannot be reversed.

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