[ A ] 3 cm 

[ B ] 4 cm  
[ C ] 5 cm  
[ D ] 1.5 cm 
[ A ] 3 cm 

[ B ] 4 cm  
[ C ] 5 cm  
[ D ] 1.5 cm 
Answer : Option B 
Explanation : 
According to the question, 4 x 2$\pi$ $r^2$= 2 x 2$\pi$ r $\times$ 8 So,r = 4 cm 
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