The angle of elevation of the top of a tower from the top of a house is $60^\circ$ and the angle of depression of its base is $30^\circ$. If the horizontal distance between the house and the tower is $12 \ m$,then the height of the tower is
- A$48 \ \sqrt{3} \ m$
- B$16 \ \sqrt{3} \ m$
- C$24 \ \sqrt{3} \ m$
- D$16 / \sqrt{3} \ m$
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