Answer c)
View Confusion: in perspective projection, objects behind the center of projection are projected upside down and backward on the view-plane.
Topological Distortion: A line segment joining a point lying in front of the viewer to a point in back of the viewer is projected to a broken line of infinite extent.
Perspective shortening: Size of object varies inversely with the distance from the center of projection.
Vanishing point: Points where set of parallel lines(not parallel to view plane) appear to meet.
Reference: http://slideplayer.com/slide/3916031/