【Daily Question】June 6, 2016: +2 Wealth for participation； +3 to 8 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) In liquid chromatography, which of the following operations can be performed to change the selectivity of the chromatographic column? A. Changing the type of mobile phase or column; B. Changing the type of stationary phase or column length; C. Changing both the type of stationary phase and the type of mobile phase; D. Changing the particle size of the packing material and column length. Correct answer: C. Reply with your answer in the comments to participate; you will receive +2 wealth points for that. If you answer all questions correctly, you’ll get an additional +3 to +8 wealth points. Those who provide thorough analyses and explanations for the questions (or include detailed calculation processes) will receive extra wealth points as well. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions.