The United States took the following actions following the rejection of the Treaty of Versailles.
As option "A" mentions it. It adopted an isolationist policy regarding foreign nations. Senator William Borah stated that if the United States were to sign the treaty it would have "forfeited and surrendered, once and for all, the great policy of no entangling alliances upon which the strength of the Republic had been founded for one hundred fifty years".
It also adopted the action in option "F", which was joining the newly established League of Nations.
Answer:
B
Explanation: because it means migration
I dont know this one sorry
C. This would enable to find the events and get his thoughts and report in order.