Sentence Correction (SC) | Re: According to findings derived from functional magnetic

hi mike
i agree that i missed out on pronoun fault but i feel that had "it" been used instead of "they" then also this option would have been wrong for the reason that i have cited

new version of C: each language occupies a distinct area of the brain when it is learned by an adult, while ------>still wrong

please share your opinion on this
thanks and regards