Final answer:
The Nativists and the Ku Klux Klan objected to immigration and played significant roles in the Red Scare, with a belief in white Protestant superiority.option B is correct answer.
Step-by-step explanation:
The groups that objected to immigration, responded to the Red Scare, and held the belief that white Protestants were superior to others were Nativists and the Ku Klux Klan (KKK). Nativists sought to limit immigration of non-Protestants and those not considered part of the 'old stock' Americans, putting forth restrictions specifically against immigrants from Central and Southern Europe, Jews, and nonwhites.
The Ku Klux Klan advocated similar ideas, actively promoting anti-immigrant, anti-Catholic, anti-Jewish, and racially supremacist ideologies.The Red Scare further heightened these sentiments, as fear of communism led to suspicion of immigrants, particularly those from Eastern Europe.
Both Nativists and the KKK capitalized on these fears, supporting restrictive immigration laws such as the Emergency Quota Act of 1921 and the Immigration Act of 1924, as well as endorsing xenophobic and racist ideologies. Their actions stood in stark contrast to the ideals of equality and opportunity that the U.S. purported to represent.