The tortuous road which has led from Montgomery, Alabama to Oslo bears witness to this truth. This is a road over which millions of Negroes are travelling to find a new sense of dignity. This same road has opened for all Americans a new era of progress and hope. It has led to a new Civil Rights Bill, and it will, I am convinced, be widened and lengthened into a super highway of justice as Negro and white men in increasing numbers create alliances to overcome their common problems.

Martin Luther King Jr., Nobel Prize acceptance speech, 1964
How does King use figurative language to express the idea that, though the journey is long and difficult, the civil rights movement will eventually be victorious?

A.
He says that Americans will "overcome their common problems."

B.
He mentions that he feels both "dignity" and "progress and hope."

C.
He refers to the "tortuous road" and "a super highway of justice."

D.
He talks about a trip from Montgomery, Alabama, to Oslo, Norway.