Concept:Subsistence agriculture is farming primarily for the farmer's own household needs rather than for market sale.
Explanation:Crops or livestock raised are mostly consumed by the farmer and the family.
Little, if any, produce remains after meeting household needs.
This means the surplus produce is small or nonexistent.
As a result, yields are generally low, not high, because farming is basic and for survival.
Savings are rarely made, and farm sizes are typically small, not large.
Therefore, the key feature of subsistence agriculture is that the surplus produce is small.
Answer:B. surplus produce is small