You are presented with the quiz "What can cause predators pain?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "threatening behavior by predators causes a porcupine to extend its quills" and "porcupine quills can be extraordinarily painful". So, what's the best answer to the question?

Pick from: + 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
Answer:
Threatening behavior towards porcupine