The best answer is D. In the third paragraph, the passage asserts that editors made their own decisions about which elements of the Native Americans’ life stories were important. It can therefore be inferred from the passage that reporting all of an informant’s information would help eliminate bias, because editing had involved subjective judgments about the intrinsic value of the information. Choice A and C can be eliminated because the passage does not attribute bias to failures in adhering to ethnological theory, to translations into the researchers’ language, or problems in the numbers and content of question posed. Choice B is not supported because the second paragraph criticizes the emotion of the report, not that of the informant, for introducing bias.