Answer:factories, construction sites, offices, and pollution sites
Explanation:
I believe this is right because each of the places in the list is a part of sales and/or service.
Factories- produce product for sale, as well as employing those in the service industry.
Construction sites- These mostly employ service workers.
Offices- These are directly service workers providing products or services.
Pollution sites- Employ workers to maintain the waste.
Hope this helps!
