The correct answer is: a) The Shivalik foothills.
The Shivalik foothills are a mountain range in the northern Indian state of Uttarakhand. They are a part of the Himalayas and are composed of sedimentary rocks. These rocks are ideal for use in building and construction because they are strong and durable. The Shivalik foothills are also relatively close to population centers, which makes it easy to transport the stone to where it is needed.
The fertile plains are not as good for building and construction because they are made up of loose soil. This soil is not as strong as the rocks in the Shivalik foothills and is more likely to erode. The fertile plains are also further away from population centers, which makes it more difficult to transport the soil to where it is needed.
Border areas are not as good for building and construction because they are often unstable. This instability can be caused by natural disasters, such as earthquakes, or by human activity, such as war. Areas with large wetlands are also not as good for building and construction because the soil in these areas is often soft and unstable.
In conclusion, the Shivalik foothills are the best region for utilizing building and construction stone because they are composed of strong and durable rocks that are close to population centers.