Coefficient of kinetic friction from a block's acceleration down an incline

1. A.
   $\frac{1}{2\sqrt{3}}$
2. B.
   $\frac{\sqrt{3}}{2}$
3. C.
   $\frac{2\sqrt{3} + 1}{2}$
4. D.
   $\frac{2\sqrt{3} - 1}{2}$

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1. A.
   $\sqrt{3} - 1$
2. B.
   $\frac{\sqrt{3}}{2}$
3. C.
   $\frac{\sqrt{2}}{3}$
4. D.
   $1 - \frac{\sqrt{3}}{2}$

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