The Forbidden City in Beijing, from which the emperors ruled by heavenly mandate, was a site which a commoner or foreigner could not enter without any permission, on pain of death.
(A) which a commoner or foreigner could not enter without any permission,
(B) which a commoner or foreigner could enter without any permission only
(C) which no commoner or foreigner could enter without permission,
(D) which, without permission, neither commoner or foreigner could only enter,
(E) which, to enter without permission, neither commoner or foreigner could do,


Why not [spoiler]A/B[/spoiler]?