Poem: O Captain! My Captain! by Walt Whitman

The poem explores a theme about--
a. the writing style of a famous poet
b. the life of a brave sea captain
c. the solemn duties of fatherhood
d. the death of a loved president

d. the death of a loved president

The poem "O Captain! My Captain!" by Walt Whitman explores the theme of the death of a loved president, specifically President Abraham Lincoln. The captain symbolizes President Lincoln, who guided the country through the Civil War but tragically lost his life. The poem mourns the loss of a great leader and the impact of his death on the poet and the nation.