NO.PZ2016010802000172
问题如下：
The most likely argument against high national debt levels is that:
选项：
A. the debt is owed internally to fellow citizens.
B. they create disincentives for economic activity.
C. they may finance investment in physical and human capital.
解释：
B is correct.
The belief is that high levels of debt to GDP may lead to higher future tax rates which may lead to disincentives to economic activity.
考点：Limitation of Fiscal Policy
解析： 财政政策所引发的较高负债如果是欠国人的钱，那么不必担心，因为政府可以通过印发钞票偿还。所以A选项不入选。
高水平的债务与GDP之比可能会导致未来更高的税率，从而抑制经济活动，因此B选项入选。
如果借债的财政支出是用于了投资，投资在了人力资本以及科技方面，那么这会加速一国的经济发展，发展产生的GDP完全足够偿付债务，所以不需要额外担心，所以C选项不入选。
Argument against & argument for 如何区分？