The correct answer is A) America First.
The other options of the question were B) the Republican Party. C) the Democratic Party. D) the Ku Klux Klan.
The outrage against Lindbergh's speech led to a steep decline in the membership of the group America First.
We are referring to the speech delivered by Charles Lindbergh, on September 11, 1941, regarding the possible conspiracy of some groups that were forcing the federal government to declare war against Germany in World War II.
The America First Committee opposed the participation of the United States in World War II. His members developed antisemitic and fascists discourses on the subject. The group disappeared when the US entered World War II after the Pearl Harbor attack.