Concept:Subsistence agriculture is a system of farming in which the farmer produces mainly for the household's own consumption, relying on family members for the labour required.
Explanation:Subsistence farming is practised to meet the food needs of the farmer and the immediate family.
Farm holdings are usually small, and the methods of production are simple and traditional.
As a result, there is little or no surplus harvest to be sold wholesale in the market.
The farmer does not employ hired workers because the scale of production is small.
Instead, the required labour is supplied by the farmer's wife, children, and other relatives.
Thus, the supply of labour by farm families is a distinctive characteristic of subsistence agriculture.
Answer:B. supply of labour by farm families