The Ku Klux Klan implies as an example of a reactionary movement.
The Ku Klux Klan is a supremacist movement from the United States, which aimed at the removal of the Blacks, African Americans and other such racial ethnicities other than the normal Americans.
It aims at destruction of such ethnicities in the American society and took efforts to make the American society exclusively for the White Americans.
Hence, option D holds true of the Ku Klux Klan.
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