Ditrama is a federation made up of three autonomous regions: Korva, Mitro and Guadar. Under the federal revenuesharing 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．The population of Korva grew by a smaller percentage than it did in previous years.

C．The populations of Mitro and Guadar each increased by a percentage that exceeded the percentage by which the population of Korva increased.

D．Of the three regions, Korva’s numerical increase in population was the smallest.

E．(E) Korva’s population grew by a smaller percentage than did the population of at least one of the other two autonomous regions.