Footsteps 100% sure because out of the 2 picks it is the only one in the phrase
Based on these lines from"the gorgon's head" by nathaniel hawthorne is an imperative sentence is: b. "be careful that they do not see you before you see them".
the "imperative" sentence is a command, so i think it's the answer b.
hope this help
Nonchalant is kinda like where you act casual
The answer is a to reinforce the meaning of the content