I'm guessing it would be B or D
Answer:
Security
Explanation:
In army related activity, observer refers to any thing that is used to collect information for the intelligence team.
In the past, the army could only rely on human labors to collect such information. But in recent years, the development of small high quality cameras and drone technology revolutionized the way army could collect their information.
Enemies could place a small observer and camouflage it without we even realizing it and it could leak the entire operation. Making them become well prepared to counter it.
I believe they basically lost trust in their people. The loyalty wasn't there. Also they lost a lot of money. War, expecially for 100years, costs a ton of money. Money for troops, amo, food, guns etc.
Yes, I think it is good to be prepared for a potential life threatening situation. Having drills allow students and staff to know an exit plan and not to go into immediate panic during an emergency.
