Which pair of finds makes Kalibangan especially important?

Kalibangan preserves intersecting furrows interpreted as a ploughed field and rows of installations often called fire altars. The furrows are unusually direct agricultural evidence, while the ritual function of the installations remains an interpretation rather than a certainty. Intersecting plough furrows and structures interpreted as fire installations fits that evidence because it matches the specific chronology, agency and function contained in the question. A comparison with the alternatives is useful: A stone pyramid and Roman coins, The Great Bath and a dockyard and Ashokan pillars and iron cannon 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 Intersecting plough furrows and structures interpreted as fire installations together with the factual context above, not the isolated option letter.