Final answer:
A hurricane damaging the Gulf Coast can cause unemployment by destroying businesses and infrastructure, leading to job loss until recovery efforts allow rebuilding and job restoration.
Step-by-step explanation:
Among the options given, one circumstance outside the economy that can cause unemployment is B. A hurricane damages the Gulf Coast. This is an example of an external shock that impacts the economy rather than being directly related to economic factors like business cycles or labor market regulations. Such a natural disaster can destroy businesses, infrastructure, and disrupt the lives of workers, leading to job loss and a temporary increase in unemployment until recovery efforts are completed and the affected areas are rebuilt.