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.\(46\pi cm^2\)