大全section11-9

9.     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（B）

(E) are not new in principle; it

为什么选B呢，与A相比意思没有改变吗？这里的one不会引起歧义吗？but one that是同位语从句吗？

谢谢！

两个分句逻辑上很连贯，不应该用semicolon分开。not...but...的句型，不是同位语从句.one指代a principle.
A里面it是指代了a new principle(it是完全指代)，逻辑不合理.