The Preexisting Conditions Clause in a Health Insurance Policy

The preexisting conditions clause in a health insurance policy

A) ensures that illness that occurred before coverage began will be covered by the policy.
B) ensures that injures that occurred before coverage began will be covered by the policy.
C) ensures that both illnesses and injuries that occurred before the coverage began will be covered by the policy.
D) excludes from coverage certain types of injuries and illnesses that began before the policy was issued.