As far as I am concerned Gao was not one of the Songhay Empire's major ones but I bet two answers should be acceptable in this question. I also think that you can include the third option from the scale represented above because <span>Algiers were quite far away on north so they couldn't be the part of the Songhay. </span>
        
                    
             
        
        
        
Answer:
I did this before the answer Is B. 
Explanation:
I hope I helped you!
 
        
             
        
        
        
 They adapted to their environment by using terrace farming, which was very important. Terrace farming is when they cut steep hills and they would build rope bridges to cross the mountains.
        
             
        
        
        
It was deloped by which the peasants of Medieval Europe became dependent on their land and lords. I hope this helps! 
        
                    
             
        
        
        
Herbert Hoover and Al Smith ran in the election of 1928. Hoover and Smith represented different backgrounds, religious ideas; each appealed to different groups of Americans.
Source -- Quizlet