Sentence Correction

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 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


I somehow don't understand why on earth , D , is not creating a comma splice.
This option sounds too too odd to be true. Can someone please help me hear it in a different way ? Plss...