School integration plans that invlove busing between suburban and central-city areas have contributed, according to a recent study, to <significant increases in housing integration, which, in turn, reduces> any future need for busing.

(A)ditto
(B)significant integration increases in houseing, which, in turn, reduces
(C)increase houseing integration significantly, which, in turn, reduces
(D)increase housing integration significantly, in turn reducing
(E)significantly increase housing integration, which, in turn, reduce


正解は（A）ですが、どなたか、なぜ他の選択肢がだめなのか、ご教授頂ければと思います。

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Re:中国問題SC(1-E1-4)

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