Answer:
D)a unit of labor resource that could be engaged in production is sitting idle.
Step-by-step explanation:
Unemployment is a situation whereby a country's sizeable population is without jobs and do not contribute to the total productivity of the country. Unemployment is an economic problem because labour , which involves skill and experience, is not been used to increase a country's productivity. Most tines , unemployment is largely caused by over population. Over population is a situation where a country's citizens are so much that most essential resources are inadequate. Over population reduces the amount of jobs available to citizens.