The fourteen-hour day not only has been reduced to one of ten hours but also, in some lines of work, to one of eight or even six.

(A) The fourteen-hour day not only has been reduced
(B) Not only the fourteen-hour day has been reduced
(C) Not the fourteen-hour day only has been reduced
(D) The fourteen-hour day has not only been reduced
(E) The fourteen-hour day has been reduced not only

OA is E
Can an Expert expatiate on the validity of this OA?