Study the map.
A map shows the leading religions in various European countries. The map indicates with dark orange shading that the leading religion in Albania, Kosovo, and Bosnia is Islam practiced by Muslims. These countries are located in eastern Europe.
Which historical factor explains the leading religion in Albania, Kosovo, and Bosnia and Herzegovina (the countries shaded dark orange)?
A.
The Ottoman empire once controlled these countries.
B.
The Byzantine empire once controlled these countries.
C.
The Roman empire once controlled these countries.
D.
The Russian empire once controlled these countries.
Which one is it? pls help