I refuse to accept despair as the final response to the ambiguities of history.

Martin Luther King Jr., Nobel Prize acceptance speech, 1964
What is the main idea of this passage?
A. Even though the world is full of doubt, King won't give up the fight.
B. Depression is the only option when faced with unending violence.
C. Seeing all the violence makes King feel uncertain about the future.
D. Violence should only be used as a last resort to end oppression.