Sikkim has a high potential for hydropower due to:

The correct answer is: a) Its mountainous terrain and rivers.

Sikkim is a mountainous state in the eastern Himalayas. It has a high potential for hydropower due to its many rivers and steep slopes. The state’s rivers are fed by melting snow and glaciers from the Himalayas, and they have a high flow rate. The steep slopes of the mountains provide the necessary head for hydropower generation.

The other options are incorrect because:

• Sikkim does not have abundant sunshine. It is located in the Himalayas, which are a rain shadow region. This means that the mountains block the moisture-laden winds from the Indian Ocean, resulting in a dry climate.
• Sikkim does not have vast coal deposits. The state’s coal reserves are small and of poor quality.
• Sikkim does not have strong coastal winds. It is located in the Himalayas, which are far from the coast.