What Experimental Evidence Suggests That a Person Born with No

What experimental evidence suggests that a person born with no photoreceptors can be helped?

A) Photoreceptors from immature mice can become incorporated into normal retinal circuitry when transplanted into genetically altered mice with dysfunctional rods.
B) Photoreceptors from immature mice increase visual acuity when transplanted into genetically altered mice with dysfunctional rods.
C) Bipolar neurons can respond to light directly when viruses induce retinal bipolar cells to express a light-sensitive ion channel.
D) All of the above