Which is a correct analysis of the sentence?

The prepositional phrase "in a feeding frenzy" acts as an gerund phrase.

The prepositional phrase "upon the breadcrumbs" acts as a verb phrase.

The prepositional phrase "on the park bench" acts as adjectival phrase.

The prepositional phrase "to toss" acts as an adverbial phrase.

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.