The question is incomplete, and the full version can be found on Quizlet.
Answer: enjambment
Step-by-step explanation:
Enjambment occurs when the idea of a verse is not completed at the line break, but it´s completed in the next line. In this kind of poetic technique, sentences will usually end in the middle of a line, instead of the end.
In the excerpt provided, line 16 ends with "and tho", an incomplete sentence that is completed in the next line: "We are not now that strength which in old days". Line 17 also ends leaving an incomplete sentence. The full sentence is completed in line 18: "moved earth and heaven".