[ A ] 1 : 5 

[ B ] 1 : 25  
[ C ] 1 : 125  
[ D ] 1 : 625 
[ A ] 1 : 5 

[ B ] 1 : 25  
[ C ] 1 : 125  
[ D ] 1 : 625 
Answer : Option B 
Explanation : 
Required ratio = $6 \times 1 \times 1 \over 6\times 5 \times 5$ = $1 \over 25$ = 1 : 25 
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