One of the unforeseen consequences of the editor’s management style is "that it

One of the unforeseen consequences of the editor’s management style is "that it
leaves so little room for innovation."
引号部分为画线部分
(A) that it leaves so little room for innovation
(B) that they leave so little room for innovation
(C) that sufficient room is not left for their innovation
(D) that innovation has so little room left from it
(E) to leave so little room for innovation
我觉得A中的it指代不明确（因为既有One of the unforeseen consequences
又有the editor’s management style）?
E为什么错呢?