Final answer:
Temperature regulation is the best example of a homeostatic motivation, as it involves maintaining a stable internal body environment despite external changes.
Step-by-step explanation:
The clearest example of a homeostatic motivation from the choices provided is temperature regulation. Homeostatic motivation involves behaviors that are aimed at keeping the body's internal environment relatively stable and balanced, known as homeostasis. Temperature regulation is a direct response to maintain homeostasis within the body, by either generating heat when the external environment is cold or cooling the body when it is hot to preserve a constant internal temperature.
Drive theory proposes that deviations from homeostasis, such as being too cold or too hot, create physiological needs that result in drive states. These drive states then direct behavior to meet those needs and bring the system back to homeostasis. In the case of temperature regulation, this could involve finding warmth when you're cold or shade and hydration when you're overheated.