The best answer is A, which paraphrases the passage’s assertion that life stores “are likely to throw more light on the working of the mind and emotions than any amount of speculation from an ethnologist or ethnological theorist from another culture”. Choice B is incorrect because the passage does not assess the difficulty of collecting life stories, and because the second paragraph discusses ways in which life stories became distorted. Choice C is incorrect because the passage does not specify how many research methods are available to ethnologists.Choice D can be eliminated because the third paragraph mentions distortion arising from ethnologists’ failure to recognize significant events in life stories.