In which sentence is the underlined phrase a prepositional phrase functioning as an adjective?
my sister moved away in 2009.
my sister was born in chicago.
she went to boarding school in coventry.
her grades gave my sister a place in the top rank of her class.

Based on the given sentences above, the one that possesses a prepositional phrase that functions as an adjective in the sentence is the last option. As you can see, the prepositions used in this sentence are "in" and "of". "in the top" describes the noun place, and the preposition "of" also describes the noun top rank.