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To find the circumference of a circle, you can use the formula C=2πr. Since the area of the flower bed is given as 36π, the radius can be found by taking the square root of the area divided by π (r=√(36π/π)=√(36)=6).
Therefore, the circumference of the flower bed is C=2π(6)=12π feet.
So, the correct answer is B) 12π feet.