To be honest, I'm not that sure on which one it is, but given choices lead me to think is the nervous system, probably because that's the reason our bodies are functioning, and compared to all other systems, the brain and the nervous system are needed for survival, otherwise you wouldn't be living.
No because it is just the measuring of your abdomen but the ex erices are
Your brain and heart hope this helps
D)The Cerebellum controls all physical coordination.
Hope this helps.