Concept:Seasonal unemployment happens when workers lose their jobs at particular times of the year because their work is only available in a specific season or period.
Explanation:A school canteen usually operates while school is in session.
During holidays, the canteen may close or reduce its activities, so its workers are not needed for that period.
These workers become temporarily unemployed when the holiday begins, and they get work again when the school reopens.
This cycle repeats every year based on the school calendar.
Therefore, the situation directly matches the definition of seasonal unemployment, where employment depends on a particular season, festival, or holiday period.
It is not structural, frictional, or residual unemployment because the job itself still exists and the worker is not changing jobs or lacking skills.
Answer:C. seasonal unemployment