Rivers flowing through Sikkim are essential for:

The correct answer is: d) All of the above

Rivers flowing through Sikkim are essential for irrigation, hydropower generation, and drinking water supply.

• Irrigation: Rivers provide water for irrigation, which is essential for agriculture. Agriculture is the main source of livelihood for the people of Sikkim.
• Hydropower generation: Rivers can be used to generate hydropower, which is a clean and renewable source of energy. Hydropower is a major source of electricity in Sikkim.
• Drinking water supply: Rivers provide water for drinking, bathing, and other domestic purposes. Clean drinking water is essential for human health.

In addition to these, rivers also play an important role in the ecosystem. They provide habitat for a variety of plants and animals, and they help to regulate the climate.