单项选择题3. What's different from what was mentioned in class? A、As of 'the Small-Big Ratio', 'Yang Energy' features a small size, meaning it is in a shy state. B、'The Small-Big Ratio' is 'the 2ndLaw of Yin-Yang Shape'. C、The Small-Big Ratio is closely related to 'Size'. D、As of 'the Small-Big Ratio', 'Yin Energy' is when the overall size is small