Answer D
In alkali earth metals reacrivity increases from top to bottom (opposite of b)
This is because as you go down, the electron shells increase by 1 shell. The farther away a shell is from the nucleus, the higher its tendency to react.
D is true because the more reactive an alkali metal is, the more vigorous the reaction will be with water.
        
                    
             
        
        
        
Answer:
Sorry I don't understand this language I'm sorry 
 
        
             
        
        
        
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