Consider the following countries : 1. Bulgaria 2. Czech Republic 3. Hungary 4. Latvia 5. Lithuania 6. Romania How many of the above-mentioned countries share a land border with Ukraine?

Option (a) is correct because, among the listed countries, only Hungary and Romania share a direct land border with Ukraine. Candidates often mistakenly include Bulgaria due to its regional proximity, but it is separated from Ukraine by Romania and the Black Sea, while the Czech Republic, Latvia, and Lithuania are buffered by intermediate nations like Slovakia, Poland, or Belarus. The core concept being tested is precise political geography and the mapping of nations adjacent to major geopolitical conflict zones.