Answer:
C: The prepositional phrase "on the park bench" acts as adjectival phrase.
Step-by-step explanation:
The correct analysis of the sentence is option C. The adjectival phrase is modifying the noun "man" by adding some information about it , which helps differentiate who "continued to toss". The function of prepositions is to show the relationship between elements in a sentence, and they can act as adverbs or adjectives.