D) The oxymoron helps the reader understand that the meeting was really not a coincidence.
In the sentence, it says that Alana "made sure that Bill overheard her plans". This tells us that she wanted him to know what she was doing. She hopes his knowledge of her plans will cause him to come to the track as well. The oxymoron confirms this when it says that their meeting was predictable; however, it's also coincidence since they did not plan the meeting together.
