You are presented with the question "What can threatening behavior be?" and the following answer choices: 
- opossums
 - painful
 - imbalanced
 - tiny
 - threatened
 - smoking
 - comprehensive
 - funny

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.


 

  painful       