One hundred years later, the negro lives on a lonely island of poverty in the midst of a vast ocean of material prosperity.

what is the literal meaning of this figurative sentence from the passage?

a)
african americans are waiting for someone to rescue them.

b)
the ocean of prosperity contains an island for african americans.

c)
some african americans live on an island in the middle of the ocean.

d)
poverty isolates african americans from the mainstream of american society.