Need more information to complete the question. what’s the data? what are you recording? what’s the experiment?
        
             
        
        
        
Each enzyme has a particular shape so that it can attach to a substrate (molecule). So, during a chemical reaction, the enzyme and substrate join together, and then the substrate is changed in some way depending what the chemical reaction is doing? hope this helps a little. 
        
             
        
        
        
the answer is A hope this helps :)