Concept:The mouldboard is the curved part of the plough that turns over the soil slice.
Explanation:The share first cuts the soil to form a furrow slice.
The mouldboard then lifts this slice and twists it sideways.
This action turns the furrow slice upside down.
Turning the soil helps bury weeds, stubble, and crop residue.
Therefore, the mouldboard is not meant for cutting, supporting the share, or steadying the plough.
Answer:C. invert the furrow slice