Answer:
A. noun
Explanation:
A "noun" refers to a name of a<em> person, place, thing, location, event, etc. </em>
In the sentence above, the word "audience" stands as a<em> noun</em>. In a specific sense, it is a <u>collective noun. </u>It is used to identify <em>a group of people or spectators. </em>This means that the audience is spectating on the beautiful dance of Shelly.
Take note that a "verb" is an action word, an "adjective" is used to describe a noun or pronoun while an "adverb" is used to describe a verb, an adjective or another adverb.
