How does the development of the speaker's emotions in "O Captain! my Captain!" contribute to the overall impact of the poem? A. The speaker's emotions remain constant, providing stability to the poem's tone. B. The speaker's changing emotions mirror the shifts in the poem's tone and contribute to the overall impact. C. The speaker's emotions are irrelevant to the poem's impact, which is solely dependent on the narrative. D. The poem's impact is determined by external factors, not the speaker's emotional development.
