Answer: Active duty military population
Step-by-step explanation:
Structural Unemployment is unemployment as a result of Companies and industries having to be restructured due to various variables with the most prevalent being technology for example, using a harvester on farms causing a farm to let go of it's previous staff who harvested by hand.
The above options allow for structural unemployment to happen except Active Duty military population.
These are already people who are employed as soldiers and are on Active - duty. They are not unemployed and do not contribute to Structural Unemployment.