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 multi-billion-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 patentinfringement
suit and the declining sales for
B. which includes the threat of a rival's multibillion-dollar patent-infringement suit
and declining sales of
C. included among these the threat from a rival's multibillion-dollar patentinfringement
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

What is the correct usage of "-ed" form?