The correct answer is: C. Both A and B
Grit and silt are fine-grained sediments that are transported by water and deposited in low-lying areas. They can be used for a variety of purposes, including:
- Land reclamation: Grit and silt can be used to raise the level of low-lying areas, making them suitable for development.
- Construction: Grit and silt can be used in the construction of roads, buildings, and other infrastructure.
- Agriculture: Grit and silt can be used to improve the drainage and fertility of agricultural land.
However, grit and silt can also have negative environmental impacts. They can pollute waterways and harm aquatic life. They can also contribute to the development of sinkholes.
For these reasons, it is important to carefully consider the potential environmental impacts before using grit and silt for any purpose.
In the case of the question, grit and silt from grit chambers may not be used for raising low-lying areas by dumping or concreting. This is because they can pollute waterways and harm aquatic life. They can also contribute to the development of sinkholes.
Therefore, the correct answer is: C. Both A and B