If a teacher asks students to volunteer at a community nursing home after school, the option that would be a negative externality is that a student would be unable to work at her part-time job on that afternoon.
Explanantion:
A negative externality could be a value that's suffered by a 3rd party as a result of an economic dealing. in an exceedingly dealing, the producer and client are the primary and secondary parties, and third parties embody someone, organization, owner, or resource that's indirectly affected.
In this case, the first party is the teacher, the second party is the student and the third party is nursing home.