In Spite of Less-Than-Optimal Currency Area Criteria at Present in the Eurozone

In spite of less-than-optimal currency area criteria at present in the Eurozone, some believe that the existence of a working currency union will result in:

A) an improvement in the criteria, as the union members are committed to work for more integration.
B) a gradual deterioration of the union, as members seek benefits from having an autonomous monetary policy.
C) tension and a power struggle over which will be the dominant economy in the union.
D) more delay in implementing needed reforms.