The correct answer is - C) Bucharest.
The starred country on the map is the Eastern European country of Romania. The capital of Romania is the city of Bucharest. Bucharest is by far the biggest city in the country. Apart from just being the capital, Bucharest is the economic, political, cultural, tourist center, thus making the country being very centralized, which is kind of a typical thing for the post communist countries.
Bucharest is located in the southern part of the country, south of the Carpathians, and north of the Danube River, in the middle between them. The city has around 1.7 million people, which interestingly enough, is actually a slight decrease since the previous census in Romania.