Final answer:
Option (D), The retiring rancher foresees an increase in land value as a viable business opportunity given the development of a ski resort nearby, which could raise demand for his adjacent land.
Step-by-step explanation:
The rancher, preparing to retire, foresees a viable business opportunity of an increase in land value following the news of a ski resort development adjacent to his property. Typically, such developments can lead to an uptick in demand for nearby land due to potential for commercial or residential construction, boosting property values. Therefore, the correct answer is D. An increase in land value.