You are presented with the question "what can animals be startled by?" and the following answer choices: 
- murmur
 - reflexes
 - vehicles
 - movement
 - rain
 - photons
 - waves
 - an object

Now knowing that loud noises can cause animals to startle and all animals are startled by an unannounced approach, a sudden movement, or a loud noise, choose the best answer.


 

    movement     