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In the atmospheric distillation of crude petroleum

[A].	the content of sulphur increases from lighter fraction to heavier ones with the residue having the highest concentration of sulphur	[B].	the content of sulphur deccreases from lighter fraction to heavier ones with the residue having the lowest concentration of sulphur
[C].	the content of nitrogen decreases from lighter fraction to heavier ones with the residue having the lowest concentration of nitrogen	[D].	none of the above

Answer: Option A