The answer is personification.
This statement reflects positivity. Positivity is a state of being determined to be affirmed. It is a mental condition that positivizes worst situations involving stress and pressure. It is also an attitude towards dealing with work, peers and other situations that tests your character as a person.
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>