Q: In this task, you're given a context passage, followed by a question that needs to be answered. Based on the paragraph, you must write unambiguous answers to the questions and your answer must refer to a specific phrase from the paragraph. If multiple answers seem to exist, write the answer that is the most plausible.
Riley told carson to give her something for letting her borrow the car. 
Question: Why did Riley do this?
A:
get a favor back