The Tehri Hydropower Complex is located on the Bhagirathi River. The correct answer is Option 2.

The Bhagirathi River is one of the two main tributaries of the Ganges River, the other being the Alakananda River. The Tehri Hydropower Complex is situated near Tehri town in the Indian state of Uttarakhand.

The complex is one of the largest hydroelectric projects in India and plays a crucial role in meeting the power demands of the region. It consists of multiple dams, including the Tehri Dam, which is the primary structure of the complex. The Tehri Dam is one of the tallest dams in the world, standing at a height of about 260 meters (850 feet).

The Bhagirathi River was chosen as the location for the Tehri Hydropower Complex due to its strong flow and potential for harnessing hydroelectric power. The complex utilizes the water flow of the Bhagirathi River to generate electricity through various stages, including diversion tunnels, powerhouses, and a reservoir.

The Tehri Hydropower Complex has significant benefits, such as providing a sustainable source of electricity, contributing to flood control in the downstream areas, and facilitating irrigation for agriculture. It has also become a popular tourist attraction, attracting visitors who are interested in witnessing the engineering marvel and enjoying the scenic beauty of the surrounding region.

In conclusion, the Tehri Hydropower Complex is located on the Bhagirathi River, making Option 2 the correct answer. The Bhagirathi River`s strong flow and hydroelectric potential made it an ideal choice for the construction of this significant hydroelectric project in Uttarakhand, India.