GWD22-32，不明白这种句式。

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 patent-infringement 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 patent-infringement 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