Chiseling depth is generally referred to

Answer: Option D

A chisel is a tool with a cutting edge blade on its end, for carving or cutting a hard material such as wood, stone or metal by hand or mechanical power.
It is a popular farming tool used for deep tillage, to loosen and aerate the soil while leaving crop residue at the surface of the soil. It generally ploughs to the depth of 50 - 60cm.