The students performed the play in the auditorium. which is the prepositional phrase in this sentence?

The prepositional phrase is in the auditorium.

At minimum a prepositional phrase includes a preposition and a noun, pronoun, gerund, or clause as the object.  Some common prepositions are at, by, in, at, to, etc... As an adverb, a prepositional phrase will answer the questions How?, When?, or Where? In this case, we can ask, "Where do the students perform?" The answer is in the auditorium.

the correct answer is: d

king hrothgar despair over the inability to defeat grendel