The displacement of the pictured position of a point of h elevation on a vertical photograph taken with a camera of 30 cm focal length, from an altitude of 3000 m, is

For a vertical photograph, the relief (height) displacement is:
d=rh/H-h
where:
(r) = radial distance of the point from the principal point
(h) = elevation of the point
(H) = flying altitude above datum
Here, (H=3000,m) and focal length (f=30,cm).

However, the value of r(distance of the pictured point from the principal point) is missing from the question. So the displacement cannot be calculated numerically.

When h value is 75m ,then answer D is possible