Which of the Following Best Describes What Insurance Companies Did

Which of the following best describes what insurance companies did to decrease their constantly increasing costs? (Select all that apply.)

A) Did not cover any illnesses that were diagnosed before the person (or his or her employer) purchased insurance
B) Limited coverage to only certain services, eliminating any that were experimental, nontraditional, or too costly
C) Reimbursed only the care that was requested by the patient's primary physician
D) Limited providing insurance to companies who hired mainly young, healthy persons
E) Required preapproval before expensive services were used
F) Ceased coverage on any person who used an exorbitant number of services, whenever possible