Which group of words in the sentence is a prepositional phrase? the children and adults watched and listened very quietly during the concert.
a. very quietlyb. watched and listenedc. children and adultsd. during the concert

The correct answer is D. during the concert

During is a preposition while "the concert" is a noun phrase consisting of "the" which is a determiner, and "concert" which is a noun. It is a prepositional phrase because it begins with the preposition during. The remaining options don't have prepositions.

Where are the options ?