What is a negative externality?

A. Negative externalities are goods or services that one consumer can limit another consumer’s use of.
B. Negative externalities occur when the social cost of a good or services is lower than the private cost.
C. Negative externalities are good or services that are subject to the free-rider problem.
D. Negative externalities occur when the social cost of a good or service is higher than the private cost.

D. Negative externalities occur when the social cost of a good or service is higher than the private cost.