Which of the following does not describe a result of the fall of the western roman empire

the byzantine empire emerged influences from various cultures

trade between the byzantine empire and asia flourished

the culture of the byzantine empire became less diverse

the byzantine empire became the seat of christianity

The one that is not a correct description is the third option: the culture of the Byzantine empire became less diverse. The empire was a melting pot of Grecian influences, Roman, Armenian, and a number of other cultures. When the Western Empire fell, it wasn't as if the plug had been pulled on this cosmopolitan nation. So the third option is not a reason for falling