The correct option is D Khadar is more fertile than Bhangar.
The Bhangar region has calcareous deposits, locally known as Kankar while the Khadar soil has fine silt and clay. The soil in Bhangar is coarser, whereas the Khadar soil is finer. Thus, Khadar is more fertile than Bhangar. And thanks to the fertile soil, there is intensive agriculture practised in the Khadar region.