Final answer:
D. The congregation filled the space under the domes and sang hymns.
Step-by-step explanation:
The answer to the question is D. The congregation filled the space under the domes and sang hymns.
In Justinian's Church of Hagia Sophia, the congregation did not fill the space under the domes and sing hymns as part of the imperial ritual. Instead, the public were only given partial views of the central nave, the emperor and patriarch met under the dome at key points in the liturgy, and the priests were invisible most of the time behind a screen.