Chernozem soils are found in

Answer: Option A

Chernozems are humus-rich fertile black grassland soils used extensively for growing cereals or for raising livestock. It has a lighter lime-rich layer beneath, typically occurring in the temperate occurring in the temperate grasslands of Russian steppes. Thus it is mainly found in Russia.
Wheat, barley and maize are typically the principal crops grown, alongside other food crops and vegetables.