In the fertile lands, we found settlements of compact type.

Explanation:

Introduction:
Settlement patterns refer to the way in which people arrange themselves in a particular area. These patterns can vary depending on factors such as topography, climate, availability of resources, and cultural factors. In the context of the given question, settlements in fertile lands can have different patterns.

Nucleated Settlements:
Nucleated settlements refer to settlements where buildings are clustered together in a compact manner. These settlements often have a central point, such as a marketplace or a religious center, around which the buildings are arranged. Nucleated settlements are commonly found in areas with limited space or where there is a need for social interaction and a sense of community. However, in the case of the given question, nucleated settlements are not mentioned as one of the options.

Linear Settlements:
Linear settlements refer to settlements that are arranged in a linear or elongated manner, often following a natural feature such as a river or a road. Linear settlements are commonly found in areas with specific transportation routes or where the land is narrow and elongated. However, in the case of the given question, linear settlements are not mentioned as one of the options.

Compact Settlements:
Compact settlements refer to settlements where buildings are closely packed together, forming a dense and compact pattern. In compact settlements, there is little space between buildings, and the village or town appears tightly organized. Compact settlements are commonly found in areas with a high population density or where there is a need for efficient land use. In the context of the given question, settlements in the fertile lands are described as "compact," indicating that the buildings are closely packed together.

Isolated Settlements:
Isolated settlements refer to settlements that are located far apart from each other, with significant distances in between. Isolated settlements are commonly found in areas with low population density or where there are physical barriers that separate the settlements. In the context of the given question, isolated settlements are not mentioned as one of the options.

Conclusion:
Based on the given information, the correct answer is option 'C' - compact settlements. These settlements in the fertile lands are characterized by closely packed buildings, indicating a high population density and efficient land use.