Read the excerpt from “the caged bird.”

but a caged bird stands on the grave of dreams
his shadow shouts on a nightmare scream
his wings are clipped and his feet are tied
so he opens his throat to sing.

what is the figurative meaning of the excerpt?

a the bird’s cage has been placed so that it overlooks a cemetery.
b the bird’s cage is so small that it cramps his wings and feet.
c the caged bird has had his hope destroyed.
d the caged bird is thinking very serious thoughts.