The correct answer is A. Coup d'état.
Explanation
The American Freedom League is the name of a political organization made up of big businessmen and some politicians, which existed in the United States in the 1930s. This organization was characterized because its members were against President Franklin Roosevelt and were conservative. One of the events that marked the history of this organization was the accusation made of promoting a coup d'état with the collaboration of retired military personnel. Therefore, the correct answer is A. Coup d'etat.