The correct answer is answer A ("Search for an exact phrase").
Google offers a few filters and many shortcuts or commands that you can apply in your searches to optimize efficiency. A very common and useful one is searching for an exact phrase. 
The method is very simple: you think of an entire phrase and put it in-between quotation marks (for example "how to use google filters"). This will only show results from pages where this whole phrase is included just the way you wrote it.
Hope this helps!
 
        
             
        
        
        
Answer:
2.5% of sea water is salt
 
        
             
        
        
        
The Great Depression severely affected Central Europe. The unemployment rate in Germany , Austria and Poland rose to 20% while output fell by 40%. By November 1949 every European country had increased tariffs or introduced quotas. Under the Dawes plan the German economy boomed in the 1920s paying reparations and increasing domestic production. Europe received almost US$8 billion in American credit between 1924 and 1930 in addition to previous war time loans. Although it originated in the United States the Great Depression caused drastic declines in output severe unemployment and acute deflation in almost every county of the world.
        
             
        
        
        
For a sense of relatability and to make a deeper meaning.
        
                    
             
        
        
        
Answer: B. King Duncan thinks Macbeth is good and virtuous man, when in reality Macbeth is plotting his murder.
Irony occurs when a character believes something that is the complete opposite of reality. For irony to work in a play, the audience usually has to have more information that the characters. In this case, the audience knows that Macbeth is planning the murder of King Duncan. However, the audience also knows that King Duncan believes Macbeth to be a good and virtuous man. This contradiction is an example of irony in the play.