Mashaal Masha
A pioneer in the field of taphonomy (the study of how organic remains become fossils), ________ may be just as prevalent in the fossil record as those of thick-shelled organisms.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
A: 

fossils of thin-shelled organisms, Anna Behrensmeyer demonstrated in a 2005 analysis,

B: 

Anna Behrensmeyer demonstrated in a 2005 analysis that fossils of thin-shelled organisms

C: 

it was demonstrated in a 2005 analysis by Anna Behrensmeyer that fossils of thin-shelled organisms

D: 

a 2005 analysis--by Anna Behrensmeyer--demonstrated that fossils of thin-shelled organisms

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