If ABCD is a rectangle, BC = x and AB = 2x, then the circumference of the circle, in terms of x, is

• A$\sqrt{3}$x$\pi$
• B$\sqrt{5}$x$\pi$
• C$\sqrt{3x}$$\pi$
• D$\sqrt{5x}$$\pi$
• E$5x^{2}\pi$

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