Please tell me the answer for below question

At the annual stockholders meeting, investors heard a presentation on the numerous challenges facing the company, including among them the threat from 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 rival's multibillion-dollar patent-infringement suit and the declining sales for
2. which includes the threat of rival's multibillion-doller patent infringement suit and declining sales of
3. include among these the threats from a rival's multibillion-doller patent infringement suit as well as decline in sales for
4.among them the threat of a rival's multibillion-doller patent infringement suit and the decline in sale of
5. among these the threats from a rival's multibillion-doller patent infringement suit as well as decline in sales for