Concept:Bush fallowing is a farming system that relies on a long rest period to restore soil fertility naturally.
Explanation:In bush fallowing, a piece of land is cultivated for a short time and then left fallow for several years.
During the fallow period, natural vegetation regrows and organic matter accumulates in the soil.
This process enables the land to regain its fertility without artificial fertilizers.
The system, however, requires large areas of land because each plot is rested for years before re-use.
Therefore, bush fallowing is not economical in the use of land.
So the claim that it is very economical in the use of land is not an advantage.
Answer:A. is very economical in the use of land