Discussion
The colour of flame depends on :
(a) Nature of combustible substance
(b) Oxygen supply
(c) Temperature of the surroundings
Answer: C
The colour of a flame depends on (a) and (b).
Different substances burn with different flames: sodium compounds give yellow, copper compounds blue-green, and so on (a). The supply of oxygen also matters: with plenty of air a Bunsen burner or LPG flame burns blue because combustion is complete, while with limited air it burns yellow and sooty from unburnt carbon (b).
The temperature of the surroundings does not decide the colour of the flame, so options including (c) are wrong, and options with only (a) or only (b) are incomplete.
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