This phenomenon, which is a medical emergency, involves the peeling of the retina away from the choroid.

Retinal detachment

Explanation:

The retina is a thin layer of cells at the back of the eyeball and it contains photosensitive cells which convert light rays into electrical nerve impulses, light is converted into neural signals sent to the brain providing us with the ability to see.

Retinal detachment is the peeling away of the retina from the wall of the eye (it’s pulled away from it’s normal position).  The detachment is caused either by a retinal hole or a retinal tear.  The hole or tear allows the fluid from the middle of the eye to communicate to a space underneath the retina, therefore if fluid accumulates underneath the retina, through this hole or tear, the retina detaches.  A retinal detachment is potentially blinding.

i believe the answer would be b. hope it : )