All but Which One of the Following Is a Valid

All but which one of the following is a valid criticism of collective bargaining and collective agreements?

A) Many agreements are interpreted far too legalistically.
B) They assume a "level playing field" between management and unions-something which in fact does not exist.
C) The basic aim of collective bargaining may be incompatible with today's globalized economy.
D) Many agreements are extremely complex and difficult to understand.
E) They haven't evolved very much over time.