Answer:
D. where
Explanation:
A prepositional phrase is a group of words in a sentence that mainly consist of a preposition and the object which it acts upon. The object in the phrase can be a noun or a gerund. The prepositional phrase could serve the purpose of describing a noun in which case it is referred to as an adjectival phrase. It could also act as an adverb in which case it is known as the adverbial phrase.
In the sentence above the prepositional phrase is 'on the last page'. It provides information on where the answer can be found. This is an adverbial phrase as it answers the 'where' question.
