【Daily Question】October 18, 2016 – Participate to earn +2 wealth； +3 to 10 wealth for correct answers

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To increase the popularity of the chemical analysis section, a \"One Question per Day\" campaign has been launched to foster an active atmosphere for technical exchanges while also providing financial rewards to users. 【Daily Question】 (Single-choice question) The density of petroleum products is related to their hydrocarbon composition. The order of density for hydrocarbons with the same number of carbon atoms is: aromatic hydrocarbons > cyclic hydrocarbons > alkanes. Therefore, the density level can be used to determine the ( ) of products of the same type. A. Composition of the fraction B. Hydrocarbon composition C. Chemical properties D. Physical properties Correct answer: B. Post your answer in the replies; participating in the quiz earns you +2 wealth points. Getting all answers correct grants an additional +3 to +8 wealth points. Those who provide thorough analyses and explanations for the questions or answers (or include detailed calculation processes) will receive extra wealth points as a reward. If your answer is correct and your analysis/explanation is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions.