Great question!
Sound waves enter your ear canal, and the ear drum starts to vibrate. This tremble causes tiny bones to move, "knocking" on the membrane window. Cochela has a ton of little hairs inside it, and once you activate it with the membrane window, those hairs change the vibrations to an electrical signal. That signal moves to your brain, and your brain tells you that you hear a sound.
D. Because sometimes there can be an underlying issue to one's behavior(s). It could be a multitude of things, anger issues, ASD spectrum, school, victim of bullying, etc.
From personal experience, not with autism, but with other mental health disorder, everyone thought I was just 'acting out'. No, I was being over-stimulated and needed to change my environment.
B. Promising to quit but does not
The answer is C. Muscle fiber or Sarcomere.