Answer:
noise
Explanation:
A subject is a noun or pronoun that performs the main action of a sentence or the one that is being described or dealt with. Although we are used to find subjects right at the beginning of sentences, they do not necessarily have to be at the beginning. In the sentence, the subject is in the middle of the construction, but we can still identify it because the “noise” is a noun, and it is what is being described. The sentence is dealing with “The noise in the building.”
