Rods and cones convert light to neural signals which the nervous system can use. ... The 100 million rods are locates in the retina away from the fovea, so they carry out peripheral vision ("side" vision towards the edge of the visual field). Figure 6 shows the distribution of rods and cones on the retina.
What? Is this a serious question?
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Answer:
Option D, How different vitamins and proteins cause genetic defects
Explanation:
Maximum opportunity for research is in option D because it covers all the three research scopes mentioned in option A, B and C
Vitamins and proteins will affect the dam, sire and offspring and all these three cases can be studied by studying the role of vitamins and proteins in genetic defects in nutshell.
Hence, instead of researching on three option i.e A, B and C individually , One can research on option D only.