【Weekly Question】Participate from 7/3 to 7/9, 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. 【Weekly Question】Single-choice question: At 25°C, when the pH value of a standard solution changes by one unit compared to that of the solution being tested, what is the change in the cell’s electromotive force? (A) 0.058 V (B) 58 V (C) 0.059 V (D) 59 V. Answer: C. Please reply with your answer; doing so earns you +2 points. Those who get all answers correct will receive an additional +3 to +8 points. Those who provide a thorough analysis or detailed calculation process for the question and answer will receive extra points as well. If your answer is correct and your analysis is accurate, it will be marked as the best reply. Feel free to answer the questions.