Answer:
The correct answer is letter "B".
The invention of hydraulic mining allow for larger mining operations since water released at high pressure could move large rocks out of the way.
Explanation:
This technique use water cannons that allows water come out with a lot of pressure. These "water cannons" are very powerful since they can throw thousands of cubic feet of water in an hour with a high speed per second. This procedure allows to drag tons of rocks, gravel, earth. The material to be removed is suspended in the water. This allows it to be washed until the collection stage.
It is also a technique that has been highly questioned because of the great negative environmental impact.
