Adverse selection in the market for health insurance arises because

A) buyers of insurance know more than insurance companies about the likelihood of an illness for which buyers want insurance.
B) the federal government intervenes in insurance markets by controlling prices and reimbursement policies.
C) many insurance companies care more about profits than they do about providing services for their customers in the event of illness.
D) insurance companies are not allowed to charge premiums that are high enough to insure against "worst-case" illness.

A