I'm going to go with A. radial balance
and D. the edges of the road :)
        
             
        
        
        
Answer:
San Vitale in Ravenna: Justinian's Little Gem
Explanation:
 
        
             
        
        
        
Realistic fog is what i found. im kinda iffy on it though. you should look more into it
        
             
        
        
        
Answer:
<em>Gregorian Chant </em>One voice singing a chant melody, accompanied by one or more voices singing the same rhythm. It is monophonic.
<em>Organum </em>Non-liturgical Latin poems set to simple melodies. It is also a polyphonic work.
<em>Conductus </em>Non-liturgical compositions that often featured two singers. It is also a polyphonic work.
<em>Motet </em>A cappella, monophonic settings of liturgical texts.
 
I have set the 4 compositional styles chronologically.