Respuesta :
Her grades gave my sister a place in the top rank of her class
The prepositions are the words which show the relationship between the pronoun and the nouns. On the other hand, the prepositional phrase starts with the prepositions and end with the object of a preposition, having one or more modifiers to describe.
The phrase which is a prepositional phrase functioning as an adjective is "in the top rank of her class."
The prepositional phrase acts as an adjective or an adverb when it answers, "which one?"
It answers the question "which rank?"- "in the top rank" hence, acts as an adjective or adverb in the prepositional phrase.