Which Argument Against Enacting Workplace Safety Regulations Can Be Justified

Which argument against enacting workplace safety regulations can be justified using economic tools or observation?

A) Compensating wage differentials give firms an incentive to provide safety features.
B) Historically,employers have provided safe working environments without regulation.
C) According to the cost-benefit principle,the marginal cost of safety virtually always exceeds the marginal benefit.
D) Insurance will cover most workplace injuries,so the safety regulations are unnecessary.