The only improvement would be C. The other options are not improvements.
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Explanation:
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Answer: Cornea, pupil, lens
Explanation:
The first section the light passes is the Cornea, this is the first section of the eye that is before the iris, pupil and anterior chamber. The pupil is the second section, it's function is it allows light meet the retina. The Lens is the third section, it helps the light to be focused on the retina.