You are presented with the question "What can cause predators pain?" and the following answer choices: 
- animals with backbones
 - Staying away from porcupine
 - Ignoring porcupine
 - pressure on the skin
 - Befriending porcupine
 - Threatening behavior towards porcupine
 - Something with a head, thorax, and abdomen
 - the body's largest organ

Now knowing that threatening behavior by predators causes a porcupine to extend its quills and porcupine quills can be extraordinarily painful, choose the best answer.


 

      Threatening behavior towards porcupine   