SHE dwelt among the untrodden ways
Beside the springs of Dove,
A Maid whom there were none to praise
And very few to love:

A violet by a mossy stone
Half hidden from the eye!
--Fair as a star, when only one
Is shining in the sky.

She lived unknown, and few could know
When Lucy ceased to be;
But she is in her grave, and, oh,
The difference to me! (Wordsworth, “She Dwelt Among the Untrodden Ways”)

Which option best explains how the choice of the word oh in the final stanza contributes to the poem’s meaning? It was selected to create a regular end rhyme. It was selected to establish assonance in the line. It was selected to maintain the line’s iambic structure. It was selected to stress the poet’s sense of loss.