Ditrama is a federation made up of three autonomous regions: Korva, Mitro, and Guadar. Under the federal revenue-sharing plan, each region receives a share of federal revenues equal to the share of the total population of Ditrama residing in that region, as shown by a yearly population survey. Last year, the percentage of federal revenues Korva received for its share decreased somewhat even though the population survey on which the revenue-sharing was based showed that Korva' s population had increased. If the statements above are true, which one of the following must also have been shown by the population survey on which last year's revenue-sharing in Ditrama was based?
A: Of the three regions, Korva had the smallest number of residents.
B: Korva's population grew by a smaller percentage than did the population of at least one of the other two autonomous regions.
C: The populations of Mitro and Guadar each increased by a percentage that exceeded the percentage by which the population of Korva increased.
D: The population of Korva grew by a smaller percentage than it did in previous years.
Choose A, B, C or D as your solution.
B