Environmental concerns related to mining in Meghalaya include:

Deforestation
Water pollution
Air pollution
All of the above

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

Mining can have a significant impact on the environment, including deforestation, water pollution, and air pollution.

Deforestation is the clearing of forests for other uses, such as agriculture or mining. This can lead to a loss of biodiversity, soil erosion, and climate change.

Water pollution can occur when mining activities contaminate water bodies with sediment, chemicals, or heavy metals. This can make the water unsafe for drinking, bathing, or fishing.

Air pollution can occur when mining activities release dust, fumes, or gases into the air. This can cause respiratory problems, heart disease, and cancer.

Mining can also have a negative impact on the social and economic environment. For example, mining can displace people from their homes and land, and it can lead to social unrest.

It is important to take steps to mitigate the environmental impacts of mining. This can include using sustainable mining practices, restoring land after mining, and monitoring air and water quality.