Explanation:

- A person who can see near objects clearly but not distant ones likely has myopia, or nearsightedness.

- 1. Excessive curvature of the eye lens:

- This leads to a shorter focal length, causing light to focus in front of the retina.

- Valid reason for myopia.

- 2. The eye-ball has become too small:

- This would lead to hyperopia or farsightedness, not myopia.

- Not valid for seeing distant objects blurry.

- 3. The focal length of the eye lens is too large:

- Causes light to focus behind the retina, also leading to hyperopia.

- Not valid for myopia.

- 4. Elongation of the eye-ball:

- Causes images to focus in front of the retina.

- Valid reason for myopia.

Correct Answer: Option:3, 1 and 4 only.