Hi, 
the order in which the houses will be flooded is A C D B, therefore the answer is letter C. You can see it looking at the lines drawn on the map, that show delimitation of areas with the same altitude from water level. The stripe of land closer to the water will be the first to be flooded.
Hope this helps! If my answer was not clear enough or you’d like further explanation please let me know. Also, English is not my first language, so I’m sorry for any mistake.
        
                    
             
        
        
        
Answer: I believe the answer would be C -- Changes observed in seismic wave data. 
Explanation:
Geologists use rock samples as direct evidence about earth's layers, and they  use seismic waves as indirect evidence to study the Earth’s structure.
I hope this helps! 
 
        
             
        
        
        
I'm not sure but I think the answer is A. Plants. Then again I'm not 100% sure that this is correct