Where is “the wild swans at coole” set?

At a lake (Gradpoint)

true. the definition explains it: a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. this is a dictionary definition that i have looked up in a dictionary.

answer; /// the correct answer to the above statement is (a) because of the decline on native american labor forces;