Official ExplanationThere is a contrast between what Martin Luther King, Jr. was really like and how he is generally perceived today. The sentence contains two important clues. First, he went through a
“process of canonization” posthumously (after his death), meaning that he was turned into a saint-like figure in the popular imagination. Second, during the process, his
“more palatable” (pleasing or easy to agree with)
“and less far-reaching political and social visions became prominent.” It must be true, then, that he had less palatable, more far-reaching visions that are now overlooked. The word in the blank should mean something like revolutionary or boundary-pushing.
“Radical” and
“immoderate” both fit this meaning. Ineffective,”
“politic” (sensible),
“incongruous” (not in harmony with the surroundings), and
“raucous” (very loud or harsh) do not fit the required meaning.
Answer: B,D