A defective eye cannot see close objects clearly because their image is formed:
A. On the eye lens
B. Between eye lens and retina
C. On the retina
D. Beyond retina

Hint:Recall the construction of the human eye. Hence, check on which part of the human eye, the image of the objects seen by the humans is formed. Also, check what the cause of the defect is in the human eye because of which the humans cannot see the close objects clearly. Hence, check where the image of the close objects formed in the human eye so that they cannot see close objects clearly.

Complete step by step answer:
When a person cannot see a close object clearly, this defect of vision is known as hypermetropia or far-sightedness.

In such people, the eye lens cannot decrease the focal length in order to converge the light rays from the close object on the retina and form the image of the object on the retina as the retina plays the role of screen where the image of the objects seen by the human eyes is formed. The light rays from the closely placed object converge beyond the retina and form the image beyond the retina. This defect can be corrected with a convex lens.
Therefore, a defective eye cannot see close objects clearly because their image is formed beyond the retina of the human eye.

Hence, the correct option is D.

Note:The students should always remember the structure of the human eye and the effect of the defects of vision in the human eye so that one can easily conclude where the image should form for normal vision and where the image is formed in the eye with defects of vision without any confusion.