The center for disease control (cdc) evaluates the marginal cost effectiveness of vaccinating all people against certain diseases. if the marginal benefit is set at $5,000, which generalization explains why the cdc does not mandate vaccination of 100% of the people? a) at low vaccination coverage rates (0-70%), the marginal cost is greater. b) at high vaccination coverage rates (70-100%), the marginal cost is less. c) at 100% vaccination coverage, the cost per case prevented is less than the marginal benefit. d) at 100% vaccination coverage, the cost per case prevented is greater than the marginal benefit.