Read the following line from "The Negro Speaks of Rivers."

"My soul has grown deep like the rivers."

Which of the following is a possible interpretation of this line in the context of the whole poem?
A- The speaker's soul looks like a large, deep river.
B- The speaker believes that when he dies, his soul will move on to an afterlife.
C- The speaker's soul feels the weight of his people's heritage and history.
D- The speaker is immortal, so his soul is as old as the rivers.

C- The speaker's soul feels the weight of his people's heritage and history.