B. An oceanic plate sinks beneath another oceanic plate at a convergent boundary
        
             
        
        
        
The length of daylight and nighttime are of equal length on an equinox because the center of the sun spends a roughly equal amount of time above and below the horizon at every location on the Earth.
        
             
        
        
        
I think it could be mountains.. if I'm wrong then I'm sorry.. 
        
                    
             
        
        
        
C. A cold religion with tundra .