The black cotton soil of India belongs to the group called Chernozem.

Option 1: Laterite soils are reddish or yellowish in color and are found in areas with high temperatures and heavy rainfall. They are not black cotton soils.

Option 2: Podzol soils are typically found in cold regions with coniferous forests. They are characterized by a leaching process that forms distinct layers, but they are not black cotton soils.

Option 3: Chernozem soils are characterized by their dark color and high fertility. They are found in grassland regions and are also known as "black earth". Black cotton soil of India belongs to this group.

Option 4: Alluvial soils are formed by the deposition of sediments carried by rivers. They are typically found in floodplains and deltas. They are not black cotton soils.

In conclusion, the correct answer is option 3 - Chernozem.