Which pair of rhyming words emphasize the THEME of the poem? (“O Captain! My Captain!” Poem)

A. "done" and "won" (lines 1 and 2, stanza 1)

B. "keel" and "vessel" (line 4, stanza 1)

C. "head" and "dead" (lines 14 and 16, stanza 2)

D. A&C