Q 3020291111.     A man standing on a level plane observes the elevation of the top of a pole to be `\alpha`. He then walks a distance equal to double the height of the pole and then finds that the elevation is now `2\alpha`. Then `\alpha=`

A

`30^{0}`

B

`15^{0}`

C

`60^{0}`

D

`45^{0}`

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