What main industry do the countries of each group have in common?
Acountries on the Adriatic Sea, such as Croatia
Bcountries on the vast plains of Europe, such as Serbia and Bulgaria
Ccountries with large forested areas, such as Belarus and Romania
Acountries on the Adriatic Sea, such as Croatia
Bcountries on the vast plains of Europe, such as Serbia and Bulgaria
Ccountries with large forested areas, such as Belarus and Romania