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The following statements concerning petroleum are all true except: A. It must be separated into fractions (by boiling) in order to be used efficiently. B. All of its hydrocarbon chains contain the same number of carbon atoms. C. It is a thick, dark liquid composed mostly of hydrocarbons. D. It was probably formed from the remains of ancient marine organisms. E. Some of the commercial uses of petroleum fractions include gasoline and kerosene.