Why does king feel some pride and satisfaction when he is criticized as an extremist

A). He knows that many great leaders in history were extremists.

Explanation:

In the context of 'Letter from Birmingham Jail,' the key reason for which Jr. Martin Luther King feels dignity and contentment on being criticized as an extremist is that 'he knew several great leaders who've brought change and reform in the society have been extremists.' Thus, he feels satisfied with being called an extremist as he knew he was on the right path in his fight against the oppression and injustices on the blacks. Thus, option A is the correct answer.

answer; i believe that the   correct answer is (d)the use of descriptive words that bring your reader into the story, not using literal words for check luck

the correct answer would be:  

a. adverb phrase