Answer:
D. Sanitary landfill
Explanation:
In a sanitary landfill, waste is separated from the surrounding environment using a system of layers designed to allow waste to decompose safely.
The best answer is C. Tailings are dangerous because they can release toxic elements into the groundwater or surface water. Tailings are the waste materials after the process of extracting the valuable part in a mine. These waste materials have a big potential to destroy the environment because they can release toxic substances which include arsenic and mercury. These tailings can contaminate water bodies.
