Answer: 3,240,000 L
Explanation:
Each tree requires 20 L of water per day for 180 days. 
Each tree therefore requires;
= 20 * 180
= 3,600 L per day
There are 900 trees to be grown;
= 900 * 3,600
= 3,240,000 L of water are required for 900 trees. 
 
        
             
        
        
        
I would say the answer would be D) 
because back then in the 20’s it was politically correct and acceptable to target particular ethnic groups from being able to migrate to your country. 
All of the other immigration acts have occurred within the last 50 years or so when it would NOT be acceptable to enforce this kind of exclusion.
hope this helps!
        
             
        
        
        
Answer:
A, primary sector
Explanation:
You can already eliminate D and E because they are not a part of a sector. The primary sector includes the production of raw materials through intense manual labor.