How is the underlined phrase in the sentence below used in the sentence?

Frustrated by the woman’s response, the border guard repeated his question.
(1 point)
1 as an adjective
2 as a noun
3 as an adverb

The underlined phrase "by the woman's response" is used as a prepositional phrase modifying the verb "frustrated." Therefore, it is being used as an adverb in this sentence.