A topographic map of Eastern Europe. Mountain ranges are circled and labeled 1 and 2. 1 is in Romania, Ukraine, Poland, and Slovakia. 2 is in Greece, Serbia, Croatia, Bulgaria, and Slovenia. Image by Natural Earth

Which of the following mountain ranges, labeled with the number 2 on the map above, extends over 330 miles and has numerous mineral resources?
A.
the Ural Mountains
B.
the Balkan Mountains
C.
the Caucasus Mountains
D.
the Carpathian Mountains