C. Since he saw that movie, he gets nervous whenever the birds sit silently on the roof and stare at him.
Explanation:
Option C is the revision that includes a prepositional phrase.
A prepositional phrase is a phrase that consist of a group of words that actually consist of a preposition, its object and words that are the modifiers.
From Option C, we can see that it is the only option that has prepositions "on" and "at". The prepositional phrase here is: "...on the roof and stare at him."
