Question

The "A" Europe's second longest river forms a border between Romania and "B" before it drains into the "C" Sea.

"A" Options
Rhine, Vardar, Elba, Danube

"B" Options
Slovenia, Croatia, Albania, Serbia

"C" Options
Black, Ionian, Baltic, Adriatic.

Answer 1

The Danube, Europe's second longest river forms a border between Romania and Serbia before it drains into the Black Sea.