B. Sugar is a pure substance.
It is sugar because sugar is made up of one atom or molecule. 
A) penny is not correct because a penny is made up of copper, zinc, and tin.
C) ocean water is not correct because its made out of water (h2o) and salt.
D) iced tea is not correct because it takes many atoms to combine in order to make tea, then you have to add water and ice to make it an iced tea.
Hope this helps! :)
        
                    
             
        
        
        
I believe the answer to your question would be Fluorine. I hope I answered your question, my friend. :) 
        
             
        
        
        
For sediments to become a sedimentary rock, it usually undergoes burial, compaction, and cementation. (Hope that helps)