Signals from a cochlear implant are recognized as sound when the brain receives signals directly from the cochlear implant that generates them by stimulating the auditory nerve, implanted directly into the brain.
A. Signals from a cochlear implant are recognized as sound when the brain receives signals directly from the cochlear implant that generates them by stimulating the auditory nerve, implanted directly into the brain - WRONG modification, it means auditory nerve is implanted into the brain
B. Signals recognized as sound by the brain are sent directly to it by the cochlear implant, which stimulates the auditory nerve and generates electrical signals, implanted directly into the brain - WRONG modification, it means electrical signals are directly implanted into the brain
C. Implanted directly into the brain, the cochlear implant stimulates the auditory nerve, generates electrical signals, and sends the signals directly to the brain, which recognizes them as sound - CORRECT modification, cochlear implant is implanted directly into brain.
D. The cochlear implant stimulates the auditory nerve, implanted directly into the brain, generates electrical signals, and sends the signals directly to the brain, which recognizes them as sound. - Same as A, WRONG modification
E. The cochlear implant, implanted directly into the brain, stimulates the auditory nerve and generates electrical signals, which are then sent directly to the brain to be recognized as a sound. - Correct modification, but "to be recognize" is wrong and wordy when compared with option C
(C) is best