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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" _________________
http://blog.ryandumlao.com/wp-content/uploads/2016/05/IMG_20130807_232118.jpg The GMAT is the biggest point of worry for most aspiring applicants, and with good reason. It’s another standardized test when most of us...