An inclined plane makes an angle $30^{\circ}$ with the horizontal. $A$ solid sphere rolls down from the top of the inclined plane from rest without slipping. Its linear acceleration along the plane is equal to (where $g$ is acceleration due to gravity and $\sin 30^{\circ} = 0.5$):
- A$\frac{5g}{14}$
- B$\frac{5g}{4}$
- C$\frac{2g}{3}$
- D$\frac{g}{3}$
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