The foreign policy adopted by the US after WWI was isolationism.
In the wake of the Great Depression and disillusioned with the effects of WWI, the US was moved to step back from giving any opinion in public affairs.
Congress passed the isolationism acts after WWI. Under this, they decided not to involve in any European and Asian matters. The US decided to untangle its political ties after WWI. With the nation being affected by the Great Depression and the losses that occurred during the war, the US took a foreign policy role called isolationism. Thus option A is correct.
