What made slavery legal was D. the Bill of Rights, Because amendment 13 officially abolished slavery in the United States and continues to this day.
So D. is your anwser.
Hope this helps. :) 
        
             
        
        
        
They must serve on juries
        
             
        
        
        
Answer:
Explanation:
Social rule can be regarded as set of behavior required to by everyone to follow been a member of the society, this rules are not the same with one that are enforced by law, it serves as guidelines for member of the society
Social rule system involves custom, norms, laws as well as taboos and others that are needed in social science as well as humanity.
 Examples of social rules are; 
1)personal space of someone should not be invaded
2) maintaining eye contact when one is talking to someone.
 
        
             
        
        
        
Answer:
Muhammad recited the words God spoke to him.
Explanation:
 
        
             
        
        
        
He thought that they were basically useless except for making clothes and cooking