Comment
Set up a proportion
12/14 = x/21
They have already won 12 out of 14 games. 
What you are asking is how many will the win (call that number x) if they play 21 games.
Solution
12/14 = x/21          Cross multiply
14* x = 12*21         Combine the right
14x = 252             Divide both sides by 14
14x/14 = 252/14    Do the division
x = 18
They should win 18 games.
 
        
             
        
        
        
answer is 
B because
if the word is plugged in then the paragraph would seem as if that it is explaining why you need patience to take pictures of snowflakes
 
        
                    
             
        
        
        
Salem and Concord Massachusetts in the late 1840's