I was actually hoping to get some options to answer this question. Since there are no options given, so i will have to answer this question from my knowledge and hope that it helps. A doctor whose father works as a janitor would be an example of inter generational mobility. It cannot be an example of vertical or horizontal mobility.
        
             
        
        
        
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Slavery was the most cruel and inhumane aspect of the triangular trade.
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Answer:
 Provinces were established in Japan in the late 7th century under the Ritsuryō law system that formed the first central government.
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These two researcher obligations, wherein the researchers make sure that the participants are told about the true nature of the study before they leave and they must make sure that the participants do not feel bad about their behavior, are referred to as debriefing and protection from harm.
 
        
             
        
        
        
At the during their term following inauguration.
According to Gallup, The approval ratings for Presidents Truman through Obama were as follows:
1st term: 47%-74%
2nd term: 36%-60%
Approval ratings drop significantly from the 1st to 2nd terms. 
A typical question asked to poll participants is “do you approve or disapprove with the way the President is handling his duties?”