The headwaters of the river Ganga is called ______.

Correct option is C

The headwaters of the river Ganga is called Bhagirathi.
 The Bhagirathi River is a significant river in the Indian state of Uttarakhand. It is one of the two headstreams of the Ganges, which is one of the most sacred rivers in India. The Bhagirathi originates at Gaumukh, which is a glacier in the Gangotri range of the Himalayas. It then flows southwards for about 205 km before joining the Alaknanda River at Devprayag to form the Ganges.
 The Bhagirathi is known for its religious and cultural importance, and it is believed to be a sacred river in Hindu mythology. The river is also an important source of irrigation and hydroelectric power for the state of Uttarakhand. There are several important towns and cities along the Bhagirathi River, including Gangotri, Uttarkashi, and Devprayag. The river is also popular for adventure sports such as white water rafting and kayaking.