Which is the capital of Bulgaria?

This question tests knowledge of European capitals. Sofia is the correct answer, serving as the capital and largest city of Bulgaria. It is a major political, economic, and cultural center in the Balkan region, with a rich history dating back thousands of years.

• Bucharest is the capital of Romania, a country located to the northeast of Bulgaria.
• Belgrade is the capital of Serbia, situated to the northwest of Bulgaria.
• Zagreb is the capital of Croatia, located further west in the Balkan Peninsula.

Each of the distractors represents the capital of a different sovereign European nation, highlighting the importance of precise geographical and political knowledge.