A prepositional phrase consists of the preposition and its complement. From the given sentences above, the sentence in which the prepositional phrase best modifies the verb saw is option C. Through the window, I saw the bird flying. The prepositional phrase in this sentence is "through the window".
The answer is A: But now, if anybody has anything to say to Raymond, anything to say about his big head, they have to come by me.
NOT C
