Safety inspector: The number of laboratory samples of rabies virus sent through the university delivery service has recently grown dangerously high. We need to limit this use of the service. Biologist: There is no need for a limit. The university delivery service has been handling rabies virus samples for 20 years with no accidents. As a rebuttal of the safety inspector's claim, the biologist's reasoning is flawed in that it ['fails to explain why the number of samples sent through the service has increased', "offers no defense of the university's need for continued delivery of rabies virus samples", 'overlooks the possibility that there has been a change in the hazardousness of the rabies virus samples themselves', 'does not address the potential for harm that is posed by the recent increase in the number of samples sent through the service']