In cold-water habitats, certain invertebrates and fish convert starches into com

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In cold-water habitats, certain invertebrates and fish convert starches into complex carbohydrates called glycerols,
in effect manufacturing its own antifreeze


(C) in effect manufacturing their own antifreeze
(D) so that they manufacture their own antifreeze


[size=13.3333330154419px]D为什么错？
[size=13.3333330154419px]C这么写一定是修饰[size=13.3333330154419px]invertebrates and fish吗？不会修饰[size=13.3333330154419px]glycerols？