number 3: Migration of people 
 
        
                    
             
        
        
        
Because it would be the right thing to do at that time
        
                    
             
        
        
        
Answer:
A developed country—also called an industrialized country—has a mature and sophisticated economy, usually measured by gross domestic product (GDP) and/or average income per resident. Developed countries have advanced technological infrastructure and have diverse industrial and service sectors.
Explanation: