Mould board instrument used for?

Correct option is A

The mouldboard is an integral part of a plough, and it is used for ploughing or turning the soil. The mouldboard plough is a traditional tillage implement that consists of a curved blade (mouldboard) designed to invert and bury the soil as the plough moves through the field. This helps in breaking and loosening the soil, burying crop residues, and preparing the field for planting. The mouldboard plays a key role in the turning of soil slices, making it an essential component of ploughing operations in agriculture.