Concept:A dot map uses a fixed dot value. Here, one dot equals 20,000 tonnes of rice.Explanation:From the dot map, region T has 3 more dots than region U.This means the difference in dots is 3 dots.Since each dot represents 20,000 tonnes, multiply the extra dots by this value.Difference=3×20,000Difference=60,000 tonnes.Therefore, region T exported 60,000 tonnes more than region U.Answer:60,000 tonnesCorrect option: C. 60,000