Concept:Succession on land that previously supported vegetation but was disturbed is known as secondary succession.
Explanation:Succession is the gradual, progressive replacement of one plant community by another in an ecosystem.
An abandoned farmland originally had natural vegetation before human activities cleared it for cultivation.
When the land is abandoned, the soil, seeds, and some organisms remain available in the area.
Because succession begins from an existing soil condition rather than from bare rock, it cannot be primary succession.
Tertiary succession is not a recognized ecological stage, and climax is the final stable community, not the process.
Hence, the succession that occurs on abandoned farmland is best described as secondary succession.
Answer:B. secondary