To truly understand why the answers are correct, you must recognize the ASL signs used. Here is a cheat sheet of the vocabulary from 11.6 MD3:

Person A needs a ride for his father to a 2:00 PM doctor’s appointment.

Maya (to Aaron): I saw you at the game last night — did you enjoy it? Aaron (to Maya): Yes! The team played well. My friend scored the winning goal. Maya (to Aaron): That must have been exciting. Do you want to practice our mini-dialogue now? Aaron (to Maya): Sure. Let’s start from the top and keep our answers natural.