The correct answer is C. Diamond drilling.
Auger boring is a method of drilling holes in the ground using a rotating auger bit. The auger bit is a hollow tube with cutting teeth on the outside. As the auger bit rotates, it cuts into the ground and removes the soil. Auger boring is often used to install water wells, septic systems, and other underground utilities.
Percussion drilling is a method of drilling holes in the ground using a rotating bit that strikes the ground with a hammer. The hammer is powered by a compressor or a gasoline engine. Percussion drilling is often used to drill water wells, oil wells, and other deep holes.
Diamond drilling is a method of drilling holes in the ground using a rotating bit that is tipped with diamonds. The diamonds cut into the ground and remove the rock. Diamond drilling is often used to drill holes in hard rock, such as granite and basalt.
Wash boring is a method of drilling holes in the ground using a rotating bit that is flushed with water. The water helps to remove the soil and rock from the hole. Wash boring is often used to drill holes in soft ground, such as sand and clay.
In diamond drilling, a solid core of rock is formed inside the cylinder. This core can be used to study the geology of the area or to extract minerals.