How does this image illustrate a contribution of the byzantine empire?

I am assuming this is a list of these options It is an example of sophisticated mosaic art commonly found in Byzantine structures. 
 It is an example of realistic paintings commonly found in Byzantine structures. 
 It shows how the Byzantines used art to call attention to social issues. 
 It shows how the Byzantines used art to depict everyday life and common people. in which case it is A

River valleys were good places for hunting and fishing.