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I'd go with E here
E means that most of the remains[...] are not mineralized, or are only partially so (mineralized)
Overall, the sentence concedes that there is a possibility that the remains are partially mineralized although most are not mineralized. A misplaces the verb "are" _________________
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...