According to the retail gravitation law, which of the following statements is true when there's a low-level C city between cities A and B?

A、Iftwocitieshaveagreatdifferenceinsize,theretailattractiontoanareaisinverselyproportionaltothedistanceratiobetweentwocitiestothethirdpower.;
B、TheratioofretailsalesattractedbytwocitiestocityCisdirectlyproportionaltothesquareofthedistanceratiotocity
C、;
C、TheratioofretailsalesattractedbytwocitiestocityCisinverselyproportionaltothepopulationofthetwocities.;
D、There’snonecessaryrelationshipamongthethreecities.