Answer:
Your answer will be D. Movement of food in small intestine.
Explanation:
SOOOOO, here's a shorter, simplified answer for you:
When you digest things, you don't control it, like you can't tell your stomach to stop moving or your heart to stop beating. That's why it's called the "Autonomous Nervous System." Meaning that it's automatic, you don't have to think about it all the time...
Hope this helps you!
