The architectural style shown is best described as

While crop rotation is a component of the three-field system, the key innovation was not merely designating different crops but ensuring one field was left fallow. The rotation of crops helped maintain soil fertility, but it was the fallowing that directly contributed to improved productivity by allowing the soil to recover.

This option misrepresents the three-field system's purpose. The system did not involve different peasants farming different fields; rather, it was about managing the same land more effectively through crop rotation and fallowing. The focus was on maximizing productivity from the land itself, not on distributing labor among multiple farmers.

This is the correct answer as the three-field system's essence was to allow one of the three fields to remain fallow each season. This practice enabled the soil to regain nutrients, thereby increasing the overall productivity of the agricultural system.

This choice refers to a different agricultural method, particularly relevant in hilly terrains, and does not pertain to the three-field system. The three-field system focused on crop rotation and fallowing rather than physical modifications to the landscape for irrigation.