Final answer:
Homeostasis is maintained through negative feedback, which keeps internal variables within a stable range in response to changes. Correct option is c)
Step-by-step explanation:
The process of maintaining the internal environment in a state compatible for life is called homeostasis, and it occurs primarily through negative feedback. Negative feedback loops work to prevent an excessive response to a stimulus by keeping a variable close to a set value. It essentially "shuts off" or "turns on" a system to maintain stable conditions within the body. Examples of such processes include the regulation of body temperature and blood glucose levels.