Sand mining along the coast can cause:

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

Sand mining along the coast can cause a number of problems, including:

• Beach erosion: Sand is a vital part of beaches, as it helps to protect them from erosion. When sand is removed from beaches, it can lead to the loss of sand dunes, which are important for protecting coastal communities from storms.
• Loss of biodiversity: Sand dunes are home to a variety of plants and animals, and when they are lost, so are the species that depend on them.
• Saline intrusion into groundwater: When sand is removed from beaches, it can expose the underlying aquifer to seawater. This can lead to the intrusion of salt water into freshwater supplies, which can be harmful to human health and the environment.

In addition to these problems, sand mining can also have a negative impact on the local economy. Beaches are a popular tourist destination, and when they are eroded, it can lead to a loss of revenue for businesses in the area.

For all of these reasons, it is important to carefully consider the environmental impact of sand mining before undertaking any projects in this area.