Which of the Following Is an Example of the Autonomic

Which of the following is an example of the autonomic nervous system at work?

A) Axel enjoys listening to bird songs early in the morning.
B) Steve's fingers flick back and forth when he watches his daughter make an exciting play during a soccer game.
C) Brett struggles to scratch an itch just out of reach between the shoulder blades.
D) Vince salivates at the smell of fresh bread baking in the kitchen.