Which one of the following statements is correct regarding ratemaking?\ A. Ratemaking systems should promote risk control.\ B. Regulators prefer that insurers implement single, large rate changes than multiple small ones.\ C. The cost of changing rates is relatively low for insurers.\ D. Ratemaking should not allow for unexpected variations in losses and expenses.

Which one of the following statements is correct regarding ratemaking? A. Ratemaking systems should promote risk control. B. Regulators prefer that insurers implement single, large rate changes than multiple small ones. C. The cost of changing rates is relatively low for insurers. D. Ratemaking should not allow for unexpected variations in losses and expenses