"Song of Myself" is a poem about the journey and the expansiveness author wants the travelers to move out of their comfort zone. The theme suggests the extension of the outreach. Thus, option D is correct.
A theme is the central and the key highlight of the context that defines the main thought and idea of the writer expressed in the poem. Herein, in "Song of Myself" Whitman expresses the theme of traveling.
He argues that travelers leave their comfort zone and travel more and more to explore the world and asks them to be the support of needy people to help them guide in their paths of life.
Therefore, option D. the expansiveness towards the outwards contributes to the theme.
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