The correct answer is - A. Mongolia.
The country of Mongolia, even though is very big, in fact 19th biggest in the world by area, it still only has around 3 million people living in it, and there's a big part of the population that is still practicing the nomadic lifestyle like in the time of Genghis Khan.
The country is landlocked, and is located between Russia and China, and has the role of a buffer state, but it seems to struggle more and more with that role and it wouldn't be weird if it loses its independence in the near future. Even though Mongolia is not in conflict with any of the two big neighbors, it is a country of interest for both of them, especially because recently huge deposits of multiple natural resources have been found there. Since both countries are much powerful and can overtake Mongolia in a day or two (without exaggeration), it wouldn't be weird if they do that inway or another in the near future.
