The best answer in my opinion is the third choice.
Answer:
Adjective Phrase: of the children
Modified Noun: voices
Explanation:
An adjective phrase is a group of words that describes a noun or a pronoun in a particular sentence. This phrase can be placed both before and after the noun it describes.
Adjective phrases usually contain adjective(s), but there are some exceptions. In some cases, a preposition (as in this case) or an adverb can be used to modify the noun. In this sentence, the adjective phrase<em> ''of the children''</em> points back to the noun<em> ''voices.'' </em>The modified noun is, therefore, <em>''voices''.</em>
