Na feeding frenzy, the pigeons descended upon the breadcrumbs that the kindly old man on the park bench continued to toss. which is a correct analysis of the sentence? a: the prepositional phrase “in a feeding frenzy” acts as an gerund phrase. b: the prepositional phrase “upon the breadcrumbs” acts as a verb phrase. c: the prepositional phrase “on the park bench” acts as adjectival phrase. d: the prepositional phrase “to toss” acts as an adverbial phrase.

In the choices you have given, the answer could be: C. The prepositional phrase “on the park bench” acts as adjectival phrase.
Preposition defines relationship of the words used in the sentence. Prepositional phrases are words that come alongside the prepositions. A determiner and adjective follows a preposition then by pronoun or noun. This is the object of the preposition. Overall, this makes up a phrase which can be an adjective, adverb, modifying noun, a locator in time or space or a teller of the when or where of events and happenings.