Answer:
Option D, How different vitamins and proteins cause genetic defects
Step-by-step 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.