[求助]蓝皮section11

1.
            Oberlin College in Ohio was a renegade institution at its 1833 founding for deciding to accept both men and women as students.

(A) at its 1833 founding for deciding to accept

(B) for the decision at its 1833 founding to accept

(C) when it was founded in 1833 for its decision to accept

(D) in deciding at its founding in 1833 to accept

(E) by deciding at its founding in 1833 on the acceptance of

为什么是这个答案？其它哪儿错了？

2.Rising inventories, when unaccompanied correspondingly by increases in sales, can lead to production cutbacks that would hamper economic growth.

A. when unaccompanied correspondingly by increases in sales, can lead

E. if not accompanied by corresponding increases in sales, can lead

when和if一个表时间，一个是条件，怎么能互换呢？

3.Research during the past several decades on the nature of language and the processes that produce and make it understandable has revealed great complexity instead of underlying simplicity.

(A) that produce and make it understandable has revealed great complexity instead of underlying simplicity

(B) of producing and understanding it have revealed not underlying simplicity but great complexity

(C) by which it is produced and understood has revealed not underlying simplicity but great complexity

(D) by which it is produced and understood have revealed great complexity rather than underlying simplicity

(E) by which one produces and understands it have revealed great complexity instead of underlying simplicity
        

我选了C，这题我比较cofuse它的结构，it指代什么呢？