If threatening behavior towards porcupine by predators can cause the predator pain, then what can cause predators pain?

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

 

      Threatening behavior towards porcupine    