How does the development of the central conflict in the poem "O Captain! my Captain!" contribute to the overall meaning of the work? A. The central conflict is irrelevant to the poem's overall meaning. B. The conflict is resolved quickly, diminishing its impact on the poem. C. The development of the conflict deepens the emotional impact of the poem. D. The poem's meaning is solely determined by external factors, not the central conflict.

C. The development of the conflict deepens the emotional impact of the poem.