Based on what I found that country is Switzerland.
The answer is: B. accommodation
Accommodation refers to a new information that can change people's existing perspective and transformed it into a new one.
in the case above, Ella's existing perspective was that all birds tweet. The parrots that showed by her friends is the new information. After seeing the new information, Ella changed her perspective towards how birds should sound.
D. a trade off is the concept that with every decision, you get something and give something else up
