Reactants: sodium metal, water
Products: sodium hydroxide, hydrogen gas
        
             
        
        
        
Hello!
Barack Obama has had many professions and he's quite educated!
Education: 
Harvard Law School, Columbia University, Harvard University, Occidental College, Columbia College.
Professions/Jobs: 
Lawyer, Politician, Law Professor, Author.
        
             
        
        
        
Hello,
Here is your answer:
The proper answer to this question is option A "The basic structure is the carbon atom".
Your answer is A.
If you need anymore help feels ree to ask me!
Hope this helps!