Hi, I got this question in a GMAT Prep practice test.

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 paent-infrigenment suit and the declining sales of
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 for
E) among these the threat from a rival's multibillion-dollar patent-infringement suit as well as the decline in sales for


I picked B. The answer is D. I thought that you could only use among for more than 2 (i.e. between for 2 comparisons, among for 2+)?

I think I see now why my answer was wrong and why D is right. "The threat..." is not parallel to "declining sales..." in B, whereas in D, "the threat" is parallel to "the decline". Is this correct?

Can someone explain this one to me? Thanks