GRE Sentence Completion

When theories formerly considered to be----in their scientific objectivity are found instead to reflect a consistent observational and evaluative bias, then the presumed neutrality of science gives way to the recognition that categories of knowledge are human----.
(A) disinterested.. constructions
(B) callous.. errors
(C) verifiable.. prejudices
(D) convincing.. imperatives
(E) unassailable.. fantasies

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Ans : (A) disinterested.. constructions