<span>D. Books became less expensive and more available throughout Europe.</span>
        
             
        
        
        
Medieval age lasted for more than thousand years. The medieval age is formerly proclaimed to be Dark Age not because it was dark but because nothing was known.
After the collapse of Greek and Roman civilizations, the whole of Europe came under the supremacy of the churches at that which gained control. It was called as nothing was known or studied about the political structure that prevailed during that period.
Dark Age does not actually refer to the time when people spent much of their time in darkness. It simply means that nothing came into light from the period when great civilizations came to an end.
 
        
             
        
        
        
Zoroastrianism is the first religion based on dualism
        
             
        
        
        
Answer:
trade
Explanation:
they traded to expand the empire
 
        
             
        
        
        
“Egyptian motifs” were used in the decoration of Roman wall paintings, and images of sphinxes appeared on Eastern roman coinage as a symbol of hope