[ A ] 9 

[ B ] 7  
[ C ] 5  
[ D ] 8 
[ A ] 9 

[ B ] 7  
[ C ] 5  
[ D ] 8 
Answer : Option A 
Explanation : 
1 $\Rightarrow$ 2 $\times$ 1 1 = 1 2 $\Rightarrow$ 2 $\times$ 2  1 = 3 3 $\Rightarrow$ 3 $\times$ 2 1 = 5 4 $\Rightarrow$ 4 $\times$ 2 1 = 7 5 $\Rightarrow$ 5 $\times$ 2 1 = 9 
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