Final answer:
The prepositional phrase in the sentence is 'down that long, narrow hallway'
Step-by-step explanation:
In the sentence, 'You'll find the wrestling coach's office down that long, narrow hallway,' the prepositional phrase is 'down that long, narrow hallway'.
The preposition 'down' indicates direction, while the phrase 'that long, narrow hallway' provides additional details about the location.
It is important to note that prepositional phrases always begin with a preposition and end with a noun or pronoun, known as the object of the preposition.
Learn more about Prepositional phrases