Which of the following was not used by the united states and western europe to increase political and economic cooperation after world war ii? a. the un b. nato c. nafta d. the marshall plan

I would say NATO would qualify as not being used to increase political and economic co-operation in Europe at least not with the Soviet Union as it was used to combat the influence of the Soviet Union at least in Europe. Amongst the Western European countries it sought cooperation but not against the Soviet Union.