You are presented with the question "Flat spots on rail car wheels can cause what to startle?" and the following answer choices: 
- animals
 - water
 - planes
 - vehicles
 - people
 - nerves
 - deaf people
 - an object

Now knowing that loud noises can cause animals to startle and flat spots on rail car wheels cause a loud banging noise, choose the best answer.


 

 animals        