Concept:Land preparation follows the order of primary tillage, secondary tillage, and then ridge formation.
Explanation:The plough is used first to break and turn the soil.
Next, the harrow is used to break clods and level the ground.
Finally, the ridger is used to make ridges or beds for planting.
Hence, the correct sequence is plough, harrow, and ridger.
Answer:A. plough, harrow and ridger