In what way do rivers symbolize people in "The Negro Speaks of Rivers"?

ALike rivers, people keep moving and finding new paths.
BLike rivers, people appear "ancient" and "dusky."
CLike rivers, people build great civilizations.
DLike rivers, people become "golden" in their old age.

Verified Answer :

I'd say the answer is A) like rivers, people keep moving and finding new paths.
He wants to say that even black people will manage to find a good future, following a new path, the same way any other human being will.
The other examples do not seem correct to me.