Final answer:
The nurse noting 'homeostasis' suggests Rohan's vitals are within a healthy range, indicating that all his physiological systems are operating normally.
Step-by-step explanation:
When the nurse writes 'homeostasis' on Rohan's chart, it indicates that Rohan's vital signs are within normal ranges. The term homeostasis refers to the body's ability to maintain a stable internal environment, keeping factors such as body temperature, heart rate, breathing rate, and blood pressure within a specific range that is healthy and stable. This concept is critical because it indicates the physiological well-being of an individual. If Rohan's vitals were abnormal, it would suggest that his body is trying to restore homeostasis through various mechanisms. In this context, Option B (His vital signs are completely normal.) would be the correct answer, as it aligns with the meaning of homeostasis.