prep 2#230 among，请进～

230.
            (28772-!-item-!-188;#058&003200)     (GWD-8-Q32)

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 multibillion-dollar patent-infringement suit and the declining sales for the company’s powerful microprocessor chip.

A. including among them the threat from a rival’s multibillion-dollar patent-infringement suit and the declining sales for

B. which includes the threat of a rival’s multibillion-dollar patent-infringement suit and declining sales of
        （主谓不一致，which修饰的是challenges，所以从句的谓语动词用include；而且普通名词与 doing+宾语
        不能并列）

C. included
            among these the threat from a rival’s multibillion-dollar patent-infringement suit as well as a decline in sales for

D. among them the threat of a rival’s multibillion-dollar patent-infringement suit and the decline in sales of

E. among these the threat from a rival’s multibillion-dollar patent-infringement suit as well as the decline in sales for

感觉把D不上，句子好像很不完整

At the annual stockholders meeting, investors heard a presentation on the numerous challenges facing the company,
            among them the threat of a rival’s multibillion-dollar patent-infringement suit and the decline in sales of the company’s powerful microprocessor chip.

这是个什么用法，among sth sth…？？