A. talking about the importance of prudence. B. talking about the necessity of caution. C. talking about the significance of discernment. D. trying to inform of how to distinguish the right from the wrong. 参考答案:A 答案解析:[详细解答] 文中提到“caution”,“discernment”,“how to distinguish the right from the wrong”,但都是作为解释“prudence”的铺