1. Passing vehicles
2. The vehicle can combust
3. If the patient has a Cervical Spine injury and moves their neck
4. Other vehicles can crash if they are looking at the collision and not the road
The answer here is B they are each made of matter. some are compounds, and some are elements they all contain Atoms this is because Silver and Oxygen are elements while Carbon Dioxide and Water are compounds. Although you do not have the choices down, I have come across this question before.
C. Halothan is the answer