Critical Reasoning (CR) | Re: The optic nerves of identical twins are genetically identical.

A. Irrelevant
B. Correctly assumes that gap between premises and the conclusion.
C. Irrelevant
D. This is not assumed but implied from the argument given.
E. Irrelevant

By assuming that the treatment of the visual impairment did not affect the optic nerve, it is clear that optic nerve plays a part in the visual impairment.

---