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.