four concentric having the same center circles with radii x 2x..., Quantitative Ability Question , GRE

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Question:Four concentric ( having the same center ) circles with radii, x, 2x, 3x and 4x are drawn to form two rings A and B as shown in the figure. 
Ratio of the area of inner ring A to the area of outer ring B is

A 1 : 2 
B 1 : 4 
C 2 : 3 
D 3 : 7 
E None

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Question:Four concentric ( having the same center ) circles with radii, x, 2x, 3x and 4x are drawn to form two rings A and B as shown in the figure. Ratio of the area of inner ring A to the area of outer ring B is

A 1 : 2

B 1 : 4

C 2 : 3

D 3 : 7

E None

D