【Daily Question】May 10, 2016 – Participate to earn +2 wealth； +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 rewards in the form of financial benefits to users. 【Daily Question】 (Single-choice question) To check for leaks in the gas lines of combustible gas pipelines or devices, it is prohibited to use ( ). A. Flame B. Soap water C. Sodium dodecyl sulfate solution D. The method of submerging part of the pipeline in water. Correct answer: A. Please reply with your answer; participating in the quiz earns you +2 points, while getting all answers correct grants an additional +3 to +8 points. Those who provide a thorough analysis and explanation of the question or answers (or include detailed calculation processes) will receive extra points as a reward. 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.