Until the Treaty of Lisbon, the Council of Ministers Used

Until the Treaty of Lisbon, the Council of Ministers used a system of qualified majority voting, which meant that

A) at least four of the "original six" had to be part of the majority that approved legislative proposals.
B) the voting power of members was weighted by population size.
C) at least three-fourths of the members had to approve legislative proposals.
D) Council decisions had to be approved by a majority of the judges in the European Court of Justice.
E) all decisions required a vote of unanimity.