The answer is A I believe
I think a simile would make the most sense. A simile is where you compare one thing to another using the words "like" or "as". In this case, the author is comparing a sentinel's tread to the watchful night wind.
The father had the son physically, but that did not mean he was his actual father if he did not care for him as his son
Example: a father had a son and abandoned him. The son was then adopted by his caring (real) father
Answer:
They cried that they had the peace at last
