You didn't place any of your following answers, which makes it difficult for people to help. What do you think it is? Out of the options that you have.
Lower cost of living
Healthier live
Cleaner environment
Less crime and gangsters
Great place to live in if you like walking and running
Friendlier community
You would have more space to do whatever u want
The continents fit together perfectly and are split at the boundaries
Based of the map, you can infer that it's D because if you look the rivers are running through multiple countries and act as a border for the countries of Germany, Austria, Hungary, etc.
hopefully this helps
