`Please try to think out of the box` – the underline part is –
Prepositional phrase
Correct
Adjective phrase
Verb phrase
Conjunctional Phrase
Explanation:
Correct Answer is: Prepositional phrase
An adpositional phrase, in linguistics, is a syntactic category
that includes prepositional phrases, postpositional phrases, and
circumpositional phrases. Adpositional phrases contain an adposition as
head and usually a complement such as a noun phrase.