Explanation:

First option is correct.

The Varuna River is a minor tributary of the Ganges River. It is named after the god Varuna. City, Varanasi. Rises from, Bhadohi.

River Pandu, a tributary of the river Ganga flows through the Southern out-skirts of the Kanpur city and receives huge quantities of industrial.

Recently, as per report in Uttar Pradesh, two major tributaries, River Pandu and River Varuna, are increasing pollution load of the Ganga.