If a negative externality exists, then there is a __________ when society produces the market output instead of the socially optimal output. This exists because the __________ to sellers and third parties are __________ the __________ derived by buyers.
a. net social benefit; costs; greater than; benefits
b. net social cost; benefits; less than; costs
c. net social cost; costs; greater than; benefits
d. net social cost; costs; less than; benefits
e. none of the above