Any health care plan that does not cover comprehensive annual checkups is risking the lives of its members, who are unlikely to obtain care that is not covered by their health care plans, and who may have conditions that, if not detected early, are more likely to become fatal. The argument above logically depends on which of the following assumptions? ["People are less likely to purchase a health care plan that does not cover annual checkups, thus negatively affecting the insurers' profitability.", 'Doctors who perform comprehensive annual checkups charge high fees, such that health care plan members cannot afford checkups that are not covered.', 'Health care plans cannot save lives unless they also cover medical procedures that treat any potentially fatal conditions that are detected.', 'Many potentially lethal conditions are likely to be detected during an annual checkup.']