单选题 How can a person acquire the greatest pleasure in the author's mind?

【正确答案】 B
【答案解析】[解析] 原文最后一段中的In so far as you are in difficulties,it is because you forget nature说明不快乐的根源是违背了自然;反之,若想得到快乐,就要遵循自然规律。