CEMC Fermat, 2005

Geometry Difficulty 2.0 Junior Find the answer Canada

In the diagram, circles $C_1$ and $C_2$ each have center $O$ . The area of the shaded region is

(A) $2\pi$ (B) $3\pi$ (C) $4\pi$ (D) $6\pi$ (E) $8\pi$

Figure for this problem

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