Answer: their
Explanation: The sentence is addressing car buyers having something, in this instance a choice. When the subject is possessive, you use their. Such as, the car buyers ate <em>their</em> lunch.
The narrator is nervous about choosing between Dauntless and Abnegation.
Actually the real answer is A to explain the significance of the topic fro the United States.
It is a type of Irony , hope this helps!
