The correct option is (c).
Explanation
Plains are broad areas of flat or gently rolling land, often formed by the deposition of alluvium by rivers. These regions offer the most favorable geographic conditions for human settlement and economic activities compared to mountains or plateaus.Statement-wise Analysis:
- Statement 1 is Correct: Plains, especially those formed by rivers (alluvial plains), are generally characterized by deep, fertile soil. This fertility supports intensive agriculture, allowing the land to sustain a high density of population through food production.
- Statement 2 is Incorrect: The flat topography of plains makes the construction of transport networks-such as roads, railways, and canals-easier and more cost-effective. In contrast, rugged terrains like mountains present significant engineering challenges for infrastructure development.
- Statement 3 is Correct: The abundance of flat land in plains facilitates the construction of settlements, commercial centers, and industrial complexes. It allows for the horizontal expansion of cities and towns, which is constrained in hilly or mountainous regions.
Key Takeaway: Plains attract high population densities primarily due to their agricultural productivity (fertile soil) and the ease of developing infrastructure (transport and housing) on flat terrain.