The correct answer would be, hierarchical system.
Sabrina made effective use of hierarchical system.
Explanation:
When people arrange things physically or in their minds in an order from above to lower to lower to above, this is called as making hierarchical system. 
Hierarchies are seen in organizations where there is a top management which is then goes down to managerial level, which further divides into supervisors and then employees of the company which represents the lowest in hierarchy. 
Similarly hierarchical systems can be found anywhere. When Sabrina remembered the things she had to buy by remembering them from generalized top category to a lower more narrowed one, she was actually made an effective use of hierarchical system. 
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The process in which is responsible of determining the
boundaries of the house districts every ten years is known to be redistricting.
This is a way or process of drawing electoral districts in boundaries that are
the ones who represent the people.
 
        
             
        
        
        
Answer:
The creation of the United Nations
Explanation:
It was created to keep peace between the participating countries. Answers A and B be be eliminated as they were previous to WWII and D can be eliminated because the United States was still considered a superpower of the world.
 
        
                    
             
        
        
        
Answer: D. Social Psychology 
Explanation:
Social Psychology is the study of attitudes in humans. The study identifies people's behaviour, feelings and thoughts and how they are influenced by the presence of others or in any given situation. Attitude is said to be the main core of the study. 
 
        
             
        
        
        
Answer:
c.) hawthorne effect 
Explanation:
The Hawthorne effect is regarded as the phenomenon in which the subjects in behavioral studies tend to change their performance in response to being observed.
It is always counter productive in terms of result because it is hard to study when results are biased, the participants knew they were being studied.
Due to the individuals knowledge that they are being studied, most times it produces not exactly the result it should.