Option a is the correct answer. Kumbh Mela is a major pilgrimage and festival in Hinduism that is celebrated four times over the course of 12 years, the site of the observance rotating between four pilgrimage places on four sacred rivers. These places are: Haridwar on the Ganga River Ujjain on the Shipra River Nashik on the Godavari River Prayag (modern Prayagraj) confluence of Ganga and Yamuna Each site's celebration is based on a distinct set of astrological positions of the Sun, the Moon, and Jupiter, the holiest time occurring at the exact moment when these positions are fully occupied