I believe the answer is "The girl who owns a red car is the one we are looking for."
The restrictive clause is "who owns a red car". That clause describes the girl.
Answer:
D) everybody on 151st Street can walk tall for another year
Explanation:
The author makes it sound that because Squeaky won the race, the residents of 151st Street are proud and confident. This means that Squeaky's win is impacting others - not just herself. Therefore, the last answer is correct.