is a characteristic of a living organism that regulates its internal environment and tends to maintain a stable, relatively constant condition.

The correct option is C Homeostasis
Health is a state of good physical, mental and social well-being. This is a state of the human body where an individual is able to do productive work with ease.

But to attain good physiological or physical state of health in the human system, homeostasis has to be achieved. Homeostasis is the ability to maintain internal stability in an organism to compensate for environmental changes.

An example of homeostasis is the human body keeping an average temperature of 98.6 degree Fahrenheit. This temperature allows our body to function normally.