King strengthens his argument in paragraph 9 by

A)
using repetition of the word "we."

B)
referring only to the injustices that occur in the South.

C)
mixing figurative language with specific examples of injustice.

D)
defiantly proclaiming that civil rights devotees will never be satisfied.

9 As we walk, we must make the pledge that we shall march ahead. We cannot turn back. There are those who are asking the devotees of civil rights, "When will you be satisfied?" We can never be satisfied as long as the Negro is the victim of the unspeakable horrors of police brutality. We can never be satisfied, as long as our bodies, heavy with the fatigue of travel, cannot gain lodging in the motels of the highways and the hotels of the cities. We can never be satisfied as long as a Negro in Mississippi cannot vote and a Negro in New York believes he has nothing for which to vote. No, no, we are not satisfied, and we will not be satisfied until justice rolls down like waters and righteousness like a mighty stream.