C) the fighting of the Persian wars
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Answer:
<em>Catholic church:</em>
<em>The crusades contributed to increase the wealth of the church and the power of the papacy. The popes took over the enterprises authority and influence, by placing their hands, their armies and resources of Christendom and adapted the people to look at them as leaders.</em>
<em>Thousands of the crusaders, returning broken in spirits and in health sought an asylum in monasterie-retreats, and along with them were their wordly goods.</em>
<em>The Crusades:</em>
<em>The Crusades were military campaigns sanctioned by the Catholic Church in the Middle Ages.</em>
<em>Effects of the crusades:</em>
<em>The crusades kept all Europe in tumult for two centuries and cost Christendom several millions of lives. The holy wars affected indirectly and became an important factor in the history of the progress of civilization.</em>
 
        
             
        
        
        
One astronomical unit is equal to the distance from Earth to the Sun. The second option among all the options given in the question is the correct option. The distance as calculated in the year 2012 by the International Astronomical Union was equal to 149597870700 meters. Astronomers like to use this unit for measuring the distances between planets and other solar bodies.
        
             
        
        
        
Explanation:
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