The proposed urban development zones do not represent a new principle; it was employed in "Operation Bootstrap" in Puerto Rico.

(A) do not represent a new principle; it
(B) represent not a new principle, but one that
(C) are not a new principle; the same one
(D) are not a new principle, but one that
(E) are not new in principle; it

OA: B

What's wrong with options C and D? Can any experts explain?