Which river flows through the city of Varanasi?

Option A (“Yamuna”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option C (“Son”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option D (“Gomti”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Therefore the correct option, index and explanation consistently identify Ganga. The Ganga River flows through Varanasi (Kashi/Benaras), one of the oldest living cities in the world. The sacred ghats of Varanasi on the banks of the Ganga are famous worldwide. The Ganga here flows from south to north (an unusual direction) due to the topography, which gives the ghats a special orientation to the east (sunrise).