一道prep语法，没有在prep详解中找到

Rachel76

At the annual stockholders meeting, investors heard a presentation on the numerous challenges facing the company, including among them the threat from a rival's multibilion-dollar patent-infringement suit and declining sales for the company's powerful microprocessor chip.

A.including among them the threat from a rival's multibilion-dollar patent-infringement suit and declining sales for
B. which includes the threat of a rival's multibilion-dollar patent-infringement suit and declining sales of
C. included among these the treat from a rival's multibilion-dollar patent-infringement suit as well as decline in sales for
D. among them the threat of a rival's multibilion-dollar patent-infringement suit and the decline in sales of
E. among these the threat from a rival's multibilion-dollar patent-infringement suit as well as decline in sales for

答案是D。可是我怎么看怎么不对呀。。ACE是可以排除，但是选D的话后半段在句子中起什么作用呢？介词可以连接这么多内容么？还有them的出现很诡异啊，按照文中的逻辑是指challenges，但是会不会有指代不清的嫌疑呢。。？疑惑啊！求解释！

eshopaholic

独立主格的倒装

个人看法

Rachel76

还是不太懂哈。。如果倒装了，原来的句子是什么样子的？