Answer: He argued for more imperialism and more isolationism.
Step-by-step explanation:
Isolationism is the diplomatic policy followed by a country that aims to be less active on the international scene. They avoid getting entangled in the affairs of other nations and prefer to focus on domestic activities.
Imperialism on the other hand, is the policy followed by a country that aims to acquire control of the resources of other countries or peoples by force or otherwise. This is where colonization falls under and it evidently does not involve isolationism.
There is therefore no contradiction in Option A because a country can be less imperialistic and still be active on the international scene.
Options B and C do not contradict each other.
Option D alone shows a contradiction as a country cannot be more imperialistic and more isolationist at the same time.