Question

Which words in the sentence are the adverb phrase?

That old lighthouse has warned sailors for many decades.









A.
has warned sailors







B.
for many decades







C.
has warned







D.

That old lighthouse

Answer 1

@Lilly_Jarzen

Answer 2

An adverb tells you how, what, when, to what extent, and under what condition. I'm pretty sure it is B.