Somebody plz help. Read the sentence.

The skillful pilot maneuvered successfully *during the training mission.*

How does the underlined phrase (in astricts) in the sentence function?

It’s a verb phrase acting as an object in the sentence.
It’s a verb phrase acting as the predicate of the sentence.
It’s a prepositional phrase acting as an adverbial phrase.
It’s a prepositional phrase acting as an adjectival phrase.