【Weekly Question】Participation from 5/1 to 5/6, 2017 +2 wealth； +3 to +10 wealth for correct answers

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To increase the popularity of the chemical analysis section, a \"Question of the Week\" campaign has been launched to foster an active atmosphere for technical exchanges while offering rewards in the form of financial benefits to users. 【Weekly Question】Multiple-choice question: A densitometer is used to measure the density of oils. When taking a reading, the line of sight must ( ). A. On the same horizontal level as the lower edge of the oil meniscus. B. On the same horizontal level as the upper edge of the oil meniscus. C. It is on the same horizontal level as the meniscus of the oil. D. It is not on the same horizontal level as the meniscus of the oil. Standard answer: B. Reply with your answer in the comments; you will receive +2 wealth points for participating in the quiz. An additional +3 to +8 wealth points will be given if all answers are correct. Extra wealth points will also be awarded if a thorough analysis and explanation of the question or answer is provided, or if detailed calculation processes are included. If your answer is correct and your analysis and explanation are accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions.