Differences in Unemployment Rates Between Countries Can Be Explained by All

Differences in unemployment rates between countries can be explained by all of the following except:

A) in Italy, laws require parents to support their adult children who do not work, even if the children are entirely capable of working.
B) restrictions on the ability of firms to terminate workers.
C) the requirement that firms pay high separation costs to workers who are fired.
D) the depreciation/appreciation of foreign exchange between countries
E) government policy with regard to the labor market.