Indentifiyng species is the answer
Most of the people with sicken multiple sclerosis have experienced vision difficulties. A vision problem is often one of the first symptoms of relapsing multiple sclerosis. It is a disease of the central nervous system which includes the optic nerve. Optic nerve transmits light and visual images to the brain. An inflammation of the optic nerve may cause a sudden loss of vision.
Option D would be that answer
