The Tapovan and Vishnugarh Hydroelectric Projects are located in Uttarakhand, which is Option 3.

1. Tapovan Hydroelectric Project: The Tapovan Hydroelectric Project is situated on the river Dhauliganga, a tributary of the Alaknanda River. It is located in Chamoli district of Uttarakhand. The project has an installed capacity of 520 MW and is being developed by the National Thermal Power Corporation (NTPC). It involves the construction of a dam, an underground powerhouse, and a 14-kilometer-long headrace tunnel. The project aims to harness the hydropower potential of the Dhauliganga River to generate electricity.

2. Vishnugarh Hydroelectric Project: The Vishnugarh Hydroelectric Project is situated on the river Dhauliganga as well, in the Chamoli district of Uttarakhand. It is also being developed by the National Thermal Power Corporation (NTPC). The project has an installed capacity of 444 MW and involves the construction of a dam, a surface powerhouse, and associated infrastructure. It aims to utilize the water resources of the Dhauliganga River to generate renewable energy.

Uttarakhand, known as the "Land of the Gods," is a state in northern India. It is renowned for its scenic beauty, including the majestic Himalayan mountain range, numerous rivers, and abundant natural resources. The state has significant hydropower potential due to its mountainous terrain and the presence of several rivers originating from the Himalayas. The Tapovan and Vishnugarh Hydroelectric Projects are part of Uttarakhand`s efforts to harness its hydropower potential and contribute to the country`s clean energy goals.

It`s worth noting that while the provided options did not include the correct answer (Uttarakhand), it is essential to verify the accuracy of information from reliable sources as it may change over time.