You are presented with the quiz "What kind of matter can produce sound?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "matter vibrating can cause sound" and "all matter emits vibrations". So, what's the best answer to the question?

Select from: (I) sensory neurons (II) all matter (III) an object (IV) only liquids (V) mechanical (VI) only plasma (VII) only solids (VIII) waves
The answer is:
(II)