Answer: The caged bird has had his hope destroyed
The easiest way to answer this question is to think logically not poetically. Let’s be real here, the first two and last options don’t even sound figurative so it’s obviously the third option “c”.
If do want a real answer from me, “a caged bird stands on the grave of dreams” pretty much sums up the fact that the birds dreams were shattered and his hope was destroyed. His wings were also clipped and feet were tied meaning that he lost his freedom and hope because he couldn’t fly.
Anyways I hope this helps :)