Homeostasis is generally maintained by an organism inside the body. Option D is the best example of the given statement.
The state which maintains the physical, chemical and internal condition inside the body by the living system is called homeostasis. This is the condition at which an organism functioned optimally which includes body temperature and blood sugar.
In other words, homeostasis is the tendency of the body to monitor and maintain its internal states up to a stable level.
Option D states that "A man sweating while he runs". It means that when a man runs, his body itself maintains its temperature and the heat energy generated during the movement of the body is converted into a sweat. Thus the man started sweating while the body temperature increases.
Hence we can conclude that option D is an example of an organism maintaining homeostasis.
To know more about homeostasis follow the link given below.
https://brainly.com/question/9087319.