I think the answer is B.
Because one of the factors that has prevented it from being a more unified country is its geography. It's rugged, mountainous. It's very difficult for any invading army to develop or control it.
I think that the answer is C. Troposphere
One reason that rock layers are not horizontal are because of erosion and it also depends we’re you find the rock layer
Dialect. Dialect is one of the multiple forms of the same language. If a new dialect is created from a language it has the potential to become a language of its own.