问题：
[单选题] Governments are keen on higher eclucation,seeing it as a means to boost social mobility and economic growth.Almost all subsidise tuition-in America,to the tune of$200bn a year.But they tend to overest
A、the value of university education is not limited to income increases.
B、university education could barely improve students'general qualities,
C、a college degree is not always a guarantee of professional knowledge.
D、spending on universities does not necessarily boost economic growth.
参考答案：
D、spending on universities does not necessarily boost economic growth.
● 参考解析
