River restoration projects in Tamil Nadu might involve:

The correct answer is: d) All of the above.

River restoration projects in Tamil Nadu might involve:

• Removing encroachments: This involves removing any structures or activities that are illegally occupying the riverbed or banks. This can include buildings, roads, and agricultural land.
• Planting trees along riverbanks: This helps to stabilize the riverbanks and prevent erosion. Trees also provide shade and help to cool the water, which can improve the health of the river ecosystem.
• Treating wastewater: This involves removing pollutants from wastewater before it is discharged into the river. This can help to improve the water quality of the river and make it safe for human use and for aquatic life.

These are just some of the possible activities that might be involved in river restoration projects in Tamil Nadu. The specific activities that are undertaken will depend on the specific needs of the river and the surrounding area.