Dholavira, excavated extensively under R. S. Bisht, is especially famous for —

Dholavira in Kutch is famous for its sophisticated system of reservoirs, channels, dams and rainwater conservation adapted to an arid environment. Lothal is associated with a dockyard, Mohenjodaro with the Great Bath and Burzahom with pit dwellings. Sophisticated water management and reservoirs fits that evidence because it matches the specific chronology, agency and function contained in the question. A comparison with the alternatives is useful: A dockyard, The Great Bath and Pit dwellings are genuine historical terms or names, but each belongs to a different office, patron, text, region or sequence. Reading the question as a relationship among person, period, place and institutional purpose prevents that mistake. The compact memory link is therefore Sophisticated water management and reservoirs together with the factual context above, not the isolated option letter.