Respuesta :
Answer:
a) loss of the Balkan provinces to the Slavs.
Explanation:
The Byzantine Empire is the name that is given to the section of the Roman Empire that survived during Late Antiquity and the Middle Ages. This is also called the Eastern Roman Empire. This empire had Constantinople as its capital city, and it continued to exist until it fell to the Ottoman Turks in 1453. However, signs of its decline started much earlier, such as the loss of the Balkan provinces to the Slavs in the late 11th century.