Concept:A nucleated settlement is one in which buildings are grouped closely together, unlike a dispersed settlement where they are scattered over a wide area.
Explanation:The main difference lies in the arrangement of buildings.
In a nucleated settlement, houses and buildings are clustered around a central point.
In a dispersed settlement, buildings are spread out separately, often as isolated farmsteads.
The other options describe possible features but not the major distinguishing difference.
Therefore, the key defining feature is the clustering of buildings.
Answer:B. has buildings clustered together