Answer:
Aerospace, Aviation, AND DEFENSE
"Countryside" refers to all the territory outside major Roman settlements (cities, towns, villages, etc.) made up of land for agriculture, but also mostly uninhabited woods, prairies, valleys, mountain sides. etc.
This is your own opinion. You can’t get a question wrong if it is an opinion. If your teacher/professor takes points off a question that is your own opinion you can contest it because your teacher would be using bias against your answer. Which teachers can’t do