Angle of elevation from C to B will be ∠4. Option (1) will be the answer.
Angle of elevation of an object from a point:
Angle of elevation of an object from a point on the ground is defined by,
"Angle between the horizontal line and line of site (line joining the observer and the object above the horizontal line)"
Following the definition,
Angle of elevation of an object at B from C will be → ∠4
Therefore, Option (1) will be the answer.
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