在棱长为1的正方体ABCD-A1B1C1D1中，平面AB1C与平面A1C1D间的距离是（）

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在棱长为1的正方体ABCD-A₁B₁C₁D₁中，平面AB₁C与平面A₁C₁D间的距离是（）

A： $\frac{\sqrt{3}}{6}$

B： $\frac{\sqrt{3}}{3}$

C： $\frac{2 \sqrt{3}}{3}$

D： $\frac{\sqrt{3}}{2}$

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B

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