He wanted to show what happens when a country is caught unaware by an enemy. (for apex)
The words in the brackets are telling the actors what to physically do, meaning it would be a stage direction.
It isn't dialogue because that is a conversation between two people.
It isn't dialect because that is how a person speaks. There is no speaking in the brackets.
It isn't narration because it isn't spoken allowed for the audience.
It isn't a description because that is too broad a term more often used for emotions.
D. The Gala apple was juicy
this is because it uses a synonym for the simple word, delicious.
it couldn't be any other because "great" and "gets" are not very precise.
hope i helped!