Answer:
D. Adjective
Step-by-step explanation:
An adjective is known to be a word that modifies a noun, noun phrase or a pronoun. It is one of the major part of speech in English language. Adjectives are also known as "describing words". They give us further details about the noun or the pronoun. It gives us details on what the noun looks like, how many the nouns are or which one it is.
So, beautiful as used in the sentence is actually describing the how Shelly's dance is. The word beautiful means extremely attractive and very pleasant.