Oxygen and glucose at top
carbon dioxide and water at bottom
        
                    
             
        
        
        
There are seven quintillion five quadrillion grains of sand on all the beaches of the world. The exact number is not known.
        
                    
             
        
        
        
Answer:
A farmer would chose a luxury crop over a high caloric or nutritionally valued crop because a luxury crop would generate them more profit. 
These are non-subsistence crops, ones that are not necessary to survive and be healthy, but luxury goods like the name implies. People are willing to pay more for them for this reason. 
 
        
                    
             
        
        
        
Answer: B) use of indentured servants, and later enslaved Africans, for agricultural labor
Explanation:
This answer fits the best. The other answers can be cancelled out.
Hope this helps!