Q 3040180913.     A man observes that when he moves up a distance c meters on a slope, the angle of depression of a point on the horizontal plane from the base of the slope is `{30}^{0}`, and when he moves up further a distance c meters the angle of depression of that is `{45}^{0}.` The angle of inclination of the slope with the horizontal is

A

`{60}^{0}`

B

`{45}^{0}`

C

`{75}^{0}`

D

`{30}^{0}`

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