21. Zoey and her two friends were driving down the highway at a constant speed. Zoey and her friend, Kasey.who was in the passenger seat wore their seatbelts. Sandy, who sat in the back seat, was to busy talking to remember to buckle up. After about 10 minutes of driving a deer jumped out in the road and Zoey had to slam on her brakes to avoid hitting it. Which of the following statements would be true? Zoey stayed in her seat but Kasey and Sandy hit their head on the door. Zoey and Kasey stayed in their seat but Sandy hit her head on the seat in front of her Everyone stayed in their seat when the brakes were hit. Zoey and Kasey stayed in their seat but Sandy hit her head on the door.