后置定语vs独立主格

AlexYYY

Women are expected to be the majority of students entering law school this fall, a trend ultimately
placing more women in leadership positions in politics and business.

(A) Women are expected to be the majority of students entering law school this fall, a trend
ultimately placing
(B) The majority of students entering law school this fall are expected to be women, a trend that will
ultimately place
(C) The majority of students entering law school this fall are expected to be women, which will
ultimately place
(D) It is expected that the majority of students entering law school this fall will be women, a trend
ultimately placing
(E) It is expected for women to be the majority of students entering law school this fall, which will
ultimately place

这道题的答案选B；
我选的A，应为我把A当成独立主格结构。 修饰整个签名的句子； 但答案里说这里是后置定语的形势；
请教下各位，在这里如何区分独立主格，和 后置定语？
因为那个trend么？ 如果没有trend， A选项变成：
Women are expected to be the majority of students entering law school this fall,  ultimately
placing more women in leadership positions in politics and business.
是否正确呢？这样就是独立主格了吧？

谢谢

li3360065

Women are expected to be the majority of students entering law school this fall,  ultimately
placing more women in leadership positions in politics and business. 也不是独立主格。
Women are expected to be the majority of students entering law school this fall造成了placing more women in leadership positions in politics and business，
这个句子也不对，placing more women in leadership positions in politics and business体现已经造成的影响，我觉得逻辑上有缺陷。

独立主格是Subject+modifier. 后置定语请参考语法。。。这个我都忘光光了。

D E it is expected that 直接秒了。C which  有问题。

A placing 修饰trend.但是这个trend will place,不是已经place ...的

如果这个句子没有体现将来时，那么A是对的。 一家之言，我也是猜测...看牛牛们更好的解释吧