The correct option is B Bulgaria
Sofia, Bulgarian Sofia, capital of Bulgaria. It is situated near the geological middle of the Balkans region, in the Sofia Basin, a channel like vale in the western part of the country. Sofia has been an area of human habitation since at least 7000 BC. It is the 13th largest city in the European Union. Sofia has been name one of the top ten best places for start-up businesses in the world, especially in information technologies. Sofia was Europe's most reasonably priced capital to visit in 2013.The name Sofia comes from the Saint Sofia Church, as different to the existing Slavic origin of Bulgarian cities and towns