pick from the following.
(1). dig in the dirt;
(2). Decrease bodily water;
(3). killing insects;
(4). lower its quills;
(5). kill them;
(6). humans disturb it;
(7). show its teeth;
(8). show its quills;

You are presented with the quiz "What might a porcupine do if threatened by a fisher?" 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 "fishers are predators that can eat porcupines". So, what's the best answer to the question?
Answer:
(8).