The best option is A, "opportunity".
The tone of a poem is defined as the perception or sentiment that the author wants to communicate through the subject of the poem. This stanza of the poem “I know why the caged bird sings by Maya Angelou” reflects the tone of opportunity and we can identify clues as to how the author feels with phrases like: “a free bird leaps…” and “dips his wing in the orange sun rays and dares…”
