Final answer:
A) Body temperature regulation can be disrupted by fever due to an infection. Hence, A) is correct.
Step-by-step explanation:
Homeostasis is the process by which animals maintain a relatively stable internal environment. An example of a homeostatic mechanism in an animal is body temperature regulation.
When the body temperature rises due to an infection, such as during a fever, it disrupts the normal homeostatic balance.
The excessive increase in body temperature is the body's response to fight against the infection, but it can be disruptive to the normal functioning of the body.