Before 1930, the city of Istanbul was known by what name?

Before 1930, the city of Istanbul was known by what name?

A Cappadocia
B Constantinople
C Byzantium

For centuries, Constantinople was the largest and wealthiest city in Europe. It was the capital of both the Roman and Ottoman Empires. After the Turkish War of Independence, Ankara was made the capital of Türkiye and in 1930 Constantinople was renamed Istanbul.

The correct answer is Constantinople.