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.

Aof the last song; an adjective phrase that modifies the noun purpose

Bto show off all the musicians’ talents; an adverb phrase that modifies the verb was

Cto show off; an adjective phrase that modifies the noun talents

Doff the musicians’ talents; an adverb phrase that modifies the verb show