Which soil is the best for cotton?

Option (b) is correct because black soil is best for cotton as cotton is a rainfed crop and it requires high moisture retention and black soil can retain water and moisture both so it is the most suitable soil for cotton.

Option (a) is not correct because mountain soil is suitable for cultivating tea, spices and coffee.

Option (c) is not correct because red soil is suitable for cultivating rice, wheat and potato.

Option (d) is not correct because Laterite is suitable for cultivating coconut and rubber.