90% of the milkshakes had whipped cream because 90/100 as a percentage is 90%
 
        
                    
             
        
        
        
Answer:
   yes
Step-by-step explanation:
The graph is of a function (one output for every input) that also passes the horizontal line test (one input for every output). Hence it is one-to-one.
For a <em>function</em>, the key for it being one-to-one is that it pass the horizontal line test.
 
        
                    
             
        
        
        
a and d b and c that's the answer