School integration plans that involve 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) significant increases in housing integration, which, in turn, reduces

(B) significant integration increases in housing, which, in turn, reduces

(C) increase housing integration significantly, which, in turn, reduces

(D) increase housing integration significantly, in turn reducing

(E) significantly increase housing integration, which, in turn, reduce


A

A- I though this is wrong because I thought the increases in integration not integration itself reduced.... so it has to be plural. Can you can conclude from this that "which" has to refer the very next item??????