Answer:
The correct answer is letter "A": National-security argument.
Explanation:
The National-security argument is a point of view that promotes the imposition of quotas and tariffs on imports related to national security in an attempt to boost domestic production on the same items. This situation will cause that in front of war the country will produce its own supplies to meet effectively its demand instead of relying on other countries to provide them with those goods. Most protectionist countries tend to support this idea.
D.
The rest simply don't make sense, but D reflects the concepts of fixed and variable costs / expenses.