The best answer would be the option B) <span>mediate disputes between management and labor. 
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Answer:
Chief Executive Commander-in-Chief,
Explanation:
Given that the President of the United States of America serves the role of the head of state and head of government in the country. 
Then the list that includes the roles of the president is being the head of the executive branch of the federal government and at the same time serves as the commander-in-chief of the United States Armed Forces.
Hence, in this case, the correct answer to the question is "Chief Executive and Commander-in-Chief"
 
        
                    
             
        
        
        
Many different groups helped in the building of the Korean Wall.
        
             
        
        
        
Answer: The 3rd Amendment
Explanation: The third amendment states this: "No Soldier shall, in time of peace be quartered in any house, without the consent of the Owner, nor in time of war, but in a manner to be prescribed by law."
 
        
             
        
        
        
He asked the Roman Catholic Church for help
This was possible for him because he was the holy roman emperor, and when he managed to beat the nobles, he also managed to increase his power through his control of the clergy, so he became the most important person in the country on numerous basis, both as a religious leader and as an emperor of the lands.