[ A ] 6.4 kg 

[ B ] 7.2 kg  
[ C ] 3.4 kg  
[ D ] 4.8 kg 
[ A ] 6.4 kg 

[ B ] 7.2 kg  
[ C ] 3.4 kg  
[ D ] 4.8 kg 
Answer : Option B 
Explanation : 
ATQ, The volume of prism n= $1\over2$x10x12)x20= 1200 cubic cm So, the weight of prism =$1200X6\over1000$= 7.2 kg 
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