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.
First, she should wash her hands. Then get some ointment to put on it. Lastly, she should put a band aid on it.
From experience with my best friend, I´d say C.
The answer is D active heart rate
