The correct answer is A. Dadri.
The foothills soils of Haryana are found in the southern part of the state, in the districts of Mahendragarh, Rewari, Gurgaon, Faridabad, and Palwal. These soils are derived from the alluvial deposits of the Yamuna River and its tributaries. They are characterized by their high fertility and their ability to retain moisture.
Dadri is a town in the northern part of Haryana, in the district of Gautam Buddha Nagar. It is located on the Yamuna River, about 30 kilometers from Delhi. The soils of Dadri are not foothills soils. They are derived from the alluvial deposits of the Yamuna River and its tributaries, but they are not as fertile as the foothills soils. They are also not as good at retaining moisture.
The other options, B. Faridabad, C. Mahendragarh, and D. Bhiwani, are all located in the southern part of Haryana and do have the expansion of foothills soils.