Answer:
voices is the noun (person, place, thing) and of the children describes voices so it is the adjective phrase.
Explanation:
Leticia was seriously annoyed by the sound of her upstairs neighbors' children playing.
Here, the adjective phrase of her upstairs neighbors' children playing modifies the noun sound . This example shows that the definition of a prepositional phrase--a preposition and its object--needs to include this clarification: and any modifiers of that object. Do you see the participle that is part of this prepositional phrase? Playing modifies children; that is why it is part of the adjective phrase also.
explanation from online school
