The Byzantine Church of Hagia Sophia Was Influential in the History

The Byzantine church of Hagia Sophia was influential in the history of architecture because it:

A) was constructed in a way that made light appear to come from directly above.
B) placed a massive dome on a building with a square shape.
C) was highly innovative in its external appearance and marble embellishment.
D) was the first Christian church converted into a mosque.
E) was the first building constructed completely from concrete.