In the figure above, the four circles have the same center and their radii are 1, 2, 3, and 4, respectively. They form two shaded rings and two write rings. What is the ratio of the area of the small shaded ring to the area of the large shaded ring?
Choices:
A.1:2
B.1:4
C.3:5
D.3:7
E.5:7
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: In the figure above, the four circles have the same center and their radii are 1, 2, 3, and 4, respectively. They form two shaded rings and two write rings. What is the ratio of the area of the small shaded ring to the area of the large shaded ring?
Choices:
A.1:2
B.1:4
C.3:5
D.3:7
E.5:7
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: In the figure above, the four circles have the same center and their radii are 1, 2, 3, and 4, respectively. They form two shaded rings and two write rings. What is the ratio of the area of the small shaded ring to the area of the large shaded ring?
Choices:
A.1:2
B.1:4
C.3:5
D.3:7
E.5:7