Final answer:
Opponents of drug legalization might argue against Irelia's proposal by citing public health concerns, including the potential for increased addiction and social costs that outweigh financial benefits.
Step-by-step explanation:
An argument that might be put forth by opponents of drug legalization, in the case of Irelia proposing to legalize drugs to address financial and law enforcement issues, would be C) Public health concerns. This argument emphasizes the potential negative health effects associated with drug use and abuse.
Approaches to reducing crime through legalization, such as the decriminalization of marijuana in some U.S. states, have shown mixed results. Benefits such as increased tax revenue and lower rates of certain types of crime must be weighed against potential increases in usage and its societal implications.