Final answer:
The clearest example of a homeostatic motivation is temperature regulation, where the body maintains a stable internal temperature by responding to changes in the environment or internal conditions.
Step-by-step explanation:
The clearest example of a homeostatic motivation is A) Temperature regulation. Homeostasis is the tendency to maintain balance or optimal levels within a biological system. In the case of temperature regulation, the body maintains a stable internal temperature by responding to changes in the environment or internal conditions. For example, when the body temperature rises, the control center in the brain sends signals to activate mechanisms like sweating to cool down the body.