The angle of elevation of the top of a tower standing on a horizontal plane from a point \( A \)...

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The angle of elevation of the top of a tower standing on a horizontal plane from a point \( A \) is \( \alpha \). After walking a distance d towards the foot of the tower, the angle of elevation is found to be \( \beta \). The height of the tower is
(A) \( \frac{d \sin \alpha \sin \beta}{\sin (\beta-\alpha)} \)
(B) \( \frac{d \sin \alpha \sin \beta}{\sin (\alpha-\beta)} \)
\( P \)
(C) \( \frac{d \sin (\beta-\alpha)}{\sin \alpha \sin \beta} \)
(D) \( \frac{d \sin (\alpha-\beta)}{\sin \alpha \sin \beta} \)
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