You are presented with the quiz "what uses hearing to sense sound?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "hearing is used for sensing sound by animals" and "humans are animals too". So, what's the best answer to the question?

OPTIONS:
i. plants;
ii. radio waves;
iii. bears;
iv. humans;
v. oak trees;
vi. Bats;
vii. Lobsters;
viii. omnivores;
The answer is:
iv.