In the diagram above, O is the center if the two concentric circle of radii 13cm and 10cm respectively. Find the area of the shaded portion in the sector with angle 120⁰ at the center

A. \(\frac{1}{3}\pi cm^2\)
B. \(\pi cm^2\)
C. \(3\pi cm^2\)
D. \(23\pi cm^2\)
E. \(46\pi cm^2\)  

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Correct Answer: E