What does matter mean?
Object which has mass and occupies space
What does atom mean?
The smallest particle of a chemical element which is made mainly by 3 sub-atomic particles called Protons,Electrons and Neutrons.
What does molecule mean?
A small group of atoms bonded together.
 
        
                    
             
        
        
        
When Sodium and Chlorine come together they transfer an electron.
- Source: google 
Hopefully this was clear and you understood! 
 
        
             
        
        
        
The answer is 
D. Covalent bond 
Hope this helps you have a great day.
        
             
        
        
        
Explanation:
I can give you some examples;
1) water
2) biomass
3)Soil
4) forest...
I hope this will help you
 
        
                    
             
        
        
        
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