请教一题

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.

1. including among them the threat from a rival’s multibillion-dollar patentinfringement suit and the declining sales for

2. which includes the threat of a rival’s multibillion-dollar patent-infringement suit and declining sales of

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

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

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

正确答案是D，这个结构似乎不常见，怎么回事？谢谢

这个我是用排除法做的哦

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.

1. including among them the threat from a rival’s multibillion-dollar patentinfringement suit and the declining sales for      including和 among 重复了

2. which includes the threat of a rival’s multibillion-dollar patent-infringement suit and declining sales of      which 修饰错

3. included among these the threat from a rival’s multibillion-dollar patentinfringement suit as well as a decline in sales for        同A

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

5. among these the threat from a rival’s multibillion-dollar patent-infringement suit as well as the decline in sales for     these 不能单独做代词出现吧；for也不对吧