Option D (retina) is correct because the textbook explicitly states that 'The eye lens forms an inverted real image of the object on the retina.' Additionally, it mentions that 'The human eye is like a camera. Its lens system forms an image on a light-sensitive screen called the retina.' The other options are incorrect because: (A) The cornea is a thin membrane through which light enters the eye and where most refraction occurs, but it is not where the image is formed. (B) The iris is a dark muscular diaphragm that controls the size of the pupil. (C) The pupil regulates and controls the amount of light entering the eye. Only the retina serves as the light-sensitive screen where the final image is formed.