The Difference in Unemployment Rates Between Europe and the U

The difference in unemployment rates between Europe and the U.S.has been narrowing partly because

A) tax rates in European countries are generally lower.
B) economic conditions in Europe and the U.S have been converging.
C) European and American labor unions have been coordinating their activities.
D) of a change in labor market policies.
E) Europe has been making it easier for workers to gain unemployment benefits