If Antibiotic Users Get All the Benefits of Antibiotics but Do

Multiple Choice

If antibiotic users get all the benefits of antibiotics but do not bear all of the costs, the social marginal cost of antibiotic use at the market equilibrium will be:

A) higher than the marginal cost to antibiotic sellers.
B) less than the marginal cost to antibiotic sellers.
C) higher than the marginal benefit to the antibiotic buyers.
D) less than the marginal benefit to the antibiotic buyers.