The correct answer is: a) Environmentally sustainable manner.
The government of Arunachal Pradesh aims to harness its hydropower potential in an environmentally sustainable manner. This means that the government will take into account the environmental impact of hydropower projects and will try to minimize any negative impacts. The government will also work to ensure that the benefits of hydropower development are shared equitably among all stakeholders.
Option b) is incorrect because it suggests that the government will build large dams to harness hydropower. Large dams can have a significant negative impact on the environment, so the government is unlikely to choose this option.
Option c) is incorrect because it suggests that the government will build hydropower projects without considering the environmental impact. This is not a sustainable approach to development, so the government is unlikely to choose this option.
Option d) is incorrect because it suggests that the government will build hydropower projects in a completely decentralized manner. This would be difficult and expensive to do, and it is not clear that it would be the most efficient way to develop hydropower.
In conclusion, the government of Arunachal Pradesh aims to harness its hydropower potential in an environmentally sustainable manner. This means that the government will take into account the environmental impact of hydropower projects and will try to minimize any negative impacts. The government will also work to ensure that the benefits of hydropower development are shared equitably among all stakeholders.