The correct answer is Dholavira. It is the historically appropriate option for the question: Evidence of advanced water management system was found at which Harappan site? The association matches the accepted archaeological site, feature, object, chronology, geographical location, excavator, or cultural practice referred to in the stem. If it asks about a site, recall its location, river, excavator, and special discovery. If it concerns an artefact, distinguish the place where it was found from the material or interpretation attached to it. Archaeological interpretations may change when new evidence appears, so use the standard association accepted in school texts and competitive examinations. Dholavira in Gujarat is famous for its sophisticated water management system, including large reservoirs, dams, and channels. This is considered one of the most advanced water conservation systems of the ancient world.