From a point on the level ground,the angle of elevation of the top of a pole is $30^{\circ}$. On moving $20 \ m$ nearer to the pole,the angle of elevation becomes $45^{\circ}$. The height of the pole (in metres) is:
- A$10(\sqrt{3}-1)$
- B$10(\sqrt{3}+1)$
- C$15$
- D$20$
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