The correct option is C Shifting cultivation
An agricultural system in which a person uses
a piece of land only to abandon or alter the initial use a short time later is
known as shifting cultivation. This system often involves clearing of a piece of
land followed by several years of wood harvesting or farming until the soil
loses fertility. Once the land becomes inadequate for crop production, it is
left to be reclaimed by natural vegetation, or sometimes converted to a
different long term cyclical farming practice. Ecological consequences from shifting
cultivation are often deleterious. Shifting cultivation results in infertility of
land. That’s why it is banned at present.