The correct option is
D All of these
The explanation for the correct answer:-
Option (D) All of the above:
- The impurities that are mixed with the ores are called gangue.
- It is a waste rock or sand and soil.
- Gravels are small water-worn or pebbles due to their loose aggregation.
- Silt is a granular material, and the size of its particles is between sand and clay.
- Thus silt is also present in the gangue.
Therefore, gangue has option (D) All of the above.