To answer this question lets take a look in each option:
Imperialism - It has several different significations, but it is more related to the system when a country rules other countries. It can be politically, economically or even socially. In several cases relying on force and violence to achieve its goals;
Isolationism - Can be seen as a national policy of avoiding any political or economic involvements with other countries. It is when a country attempts to achieve its own development without relying on any foreign nation.
Interventionism - Is the attempt of the state to influence a political, economical or social sphere which is not directly under its control.
Internationalism - It is the total contrary of the isolationism, it advocates the political and economical cooperation between nations in order to achieve an international good.
As a result, the foreign policy position most associated with aggression and war is imperialism.