In which of the following places do the two rivers named Bhagirathi and Alaknanda merge and take the name Ganga?

Option 1: Prayagraj -> This is the confluence of Ganga, Yamuna, and Saraswati rivers, not where Bhagirathi and Alaknanda meet.

Option 2: Devprayag -> This is the sacred confluence where Bhagirathi and Alaknanda rivers merge to form the Ganga.

Option 3: Varanasi -> This is a holy city situated on the banks of the Ganga, not a confluence point.

Option 4: Haridwar -> This is where the Ganga enters the Indo-Gangetic plains from the Himalayas, downstream from the actual confluence.

Hence, Option 2: Devprayag -> Devprayag, located in Uttarakhand at an altitude of about 830 meters, is one of the Panch Prayag (five sacred confluences) where the Bhagirathi (considered the source stream) and Alaknanda rivers meet to officially form the holy river Ganga -> correct