The correct option is A emphasizes the main theme
The poet chooses to some phrases and words like "Better to see your temple worn,/ Than to forget to follow, follow,/ After the sound of a silver horn" in order to emphasize the central idea of the poem which dictates that one should not just go through the motions in life, that is, not to live unconsciously. When the words are repeated we realize importance of the message that the poet is trying to convey. B is the correct answer. A, C, D and E are incorrect as they do not fit into the context of the poem.