Answer:
Where are the following? You have to post the full question if you want help.
Explanation:
 
        
             
        
        
        
<span>C. 3
   Due to the different speeds of P and S waves, a single seismometers can determine the distance to an earthquake. So, for a single station, the localization is any point on a circle around the station. With 2 stations, you'll have two circles that intersect at two points. The 3rd station is needed in order to determine which of the 2 points is the actual earthquake.</span>
        
             
        
        
        
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