Answer :
"A. isolationism" is the position that is opposed to this type of American foreign policy, which is often referred to as "interventionism". The interventionists have historically won the argument.
The correct answer is A. Isolationism.
Isolationism is a foreign policy strategy that asserts to not intervene in foreign affairs that do not imply a real threat to the country. This policy limits the participation of a particular state in the international arena in order to avoid unnecessary conflicts or undesirable political, economic, or cultural influences. Different countries have taken Isolationism as a main foreign policy throughout history, like China during the Ming dynasty in the 15th century and the US during the 19th century.