In order for the local residents to lower the frequency of landslides in the region that experiences frequent landslides from heavy rains, they should do the following:
A. Start contour plowing on the slopes where landslides happen.
B. Plant vegetation on the slopes that experience landslides.
        
             
        
        
        
Answer:
Looking it up would easily help you-
Explanation:
 
        
             
        
        
        
<span>The mantle is more dense, so it can not B. 
 Not even A , because the crust sure does contain naturally occurring radioactive material. Heat  is also not  efficiently transferred to the surface--most ground is cool,
so correct option is none is above that is D 
hope it helps</span>
        
                    
             
        
        
        
I would asy thd answer would be d if its not my bad .