What is the prepositional phrase in this sentence, and what does it modify? the purpose of the last song was to show off all the musicians’ talents. a. of the last song; an adjective phrase that modifies the noun purpose b. to show off all the musicians’ talents; an adverb phrase that modifies the verb was c. to show off; an adjective phrase that modifies the noun talents d. off the musicians’ talents; an adverb phrase that modifies the verb show