单选题 Why do modern states invest in institutions of learning?
【正确答案】 B
【答案解析】[解析]该题从第一段第三句 modern states“invest” in institutions of learning to get back“interest”in the form of a large group of enlightened young men and women who are potential leaders 中的 to get back“interest”可知正确答案为B。而C只是对其字面意思的理解。A、D文中没有提到。