【Weekly Question】Participate from 1.9 to 1.14, 2017 for +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 providing rewards in the form of financial benefits to users. 【Daily Question】Multiple-choice question: When determining calcium using atomic absorption spectroscopy, EDTA is added to eliminate ( ) interference. A. Sulfuric acid B. Sodium C. Phosphoric acid D. Magnesium Correct answer: C. Post your answer in the reply section; 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.