The correct option is D all of the above
According to the variations in
relief features, the North-Central plains can be
divided into four regions. The rivers, after
descending from the mountains deposit
pebbles in a narrow belt of about 8 to 16 km
in width lying parallel to the slopes of the
Shiwaliks. It is known as bhabar. All the
streams disappear in this bhabar belt. South
of this belt, the streams and rivers re-emerge
and create a wet, swampy and marshy region
known as terai. This was a thickly forested
region full of wildlife. The largest part of the northern plain is
formed of older alluvium. They lie above the
flood plains of the rivers and present a terrace
like feature. This part is known as bhangar. The soil in this region contains calcareous
deposits locally known as kankar. The newer,
younger deposits of the flood plains are called
khadar.