The shift in the poem’s rhythm in the last stanza signifies _. A. the speaker’s confusion B. a resolution to the conflict C. that the poem is a sonnet D. an irregular rhyme scheme

I believe the shift in the poem's rhythm in the last stanza signifies B. a resolution to the conflict.

Explanation:

As we can see from the previous stanzas, a woman is holding her beloved one, trying to keep him alive and warm by enveloping him with her hair. It is too late, however, and he is already dead. She is unwilling to accept it, but someone else is urging her to, asking her to let go of his body. The final stanza puts an end to this conflict. It is as if the speaker is exclaiming, painfully, asking the night to hide such suffering away. The speaker does not sound confused, just hurt by the sad happening.