Which river drains into the Rann of Kutch?

Option A (“Mahi”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option B (“Sabarmati”) 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 (“Narmada”) 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 Luni. The Luni River drains into the Rann of Kutch in Gujarat. It originates in the Aravalli Hills near Ajmer (Rajasthan) and flows southwestward through the Thar Desert before reaching the Rann of Kutch. The Luni River is saline in its lower reaches due to the saline soil of the desert.