[問題]考古form18- Q5

[MonkMaxwell]

The proposals for commercial and residental building in the area have been scaled down because of a disagreement between commercial planners and the regional planning commission over if continued growth will hasten the decline of neighboring cities.

(C) and the regional planning commission over whether continued growth will hasten the decline of

(E) and the regional planning commission about continued growth hastening declension in

答案是(C) 我選了(E)
想請問各位前輩
除了declension改變句意之外
中間的over是什麼慣用法嗎
還有為什麼會用到whether呢?

第一次發表文章 還請多指教 謝謝:)

[freshmanduke]

1.這裡over 等於about
2.C用whether來引出子句 比 E 來的精簡明白
3.E太wordy 而且改變語意