I believe that their is the correct pronoun for this. Hope this helps:)
The sentence that best explains the effect of the metaphor '<span>But a bird that stalks down his narrow cage can seldom see through his bars of rage' would be letter d. The metaphor explains that the bird that is trapped may be consumed by its own anger.</span>
Answer:
i have no clue and i need help to :/
anger or annoyed are the words most suitable for it