You are presented with the question "What threat would cause a porcupine to extend its quills?" and the following answer choices: 
- snow
 - killing insects
 - being eaten
 - wind
 - rain
 - threatened
 - sea urchins
 - opossums

Now knowing that threatening behavior by predators causes a porcupine to extend its quills and predators kill and eat their prey, choose the best answer.


 

   being eaten      