Put in descending order of area with the following soils in India:
I. Red soils
II. Black soils
III. Laterite soils
IV. Alluvial soils

Here's the order of these soils in descending order of area in India:

Alluvial soils (IV) - These are the most extensive soils in India, found in the Indo-Gangetic plains and along river banks. They are highly fertile.
Black soils (II) - Also known as Regur soils, they are found in the Deccan Plateau region. They are suitable for cotton and some other crops.
Red soils (I) - These are found in many parts of India, especially in peninsular India. They are less fertile than alluvial soils.
Laterite soils (III) - These are mainly found in the western coastal areas, northeastern states, and parts of southern India. They are less fertile and may have a high iron content.
So, the correct order in descending area is Option B: IV, II, I, III.