Which word in the sentence is a preposition?

the lazy pig rolled slowly around the muddy pen.

a.
muddy

b.
around

c.
slowly

d.
lazy

First, you need to know what a preposition is. A preposition is a word that links to a pronoun or noun. In the sentence, Lazy would be the adjective, Pig would be the noun, rolled is the verb, and slowly is the adverb. I would have to say around is the preposition.