The correct option is A Till the 19th century, the Balkan region was mostly under the control of the Ottoman Empire.
The Balkan regions include present-day regions of Romania, Bulgaria, Albania, Greece, Macedonia, Croatia, Bosnia-Herzegovina, Slovenia, Serbia and Montenegro. They are also known as Slavs. Till the 19th century, the Balkan region were mostly under the control of the Ottoman Empire. The Balkan states fought with each other to grab more territory. They fell prey to the imperialist ambitions of major European powers.