Hey there, thanks for your post. This question asks about the approach to history taken by "mainstream U.S. historians of the late nineteenth and early twentieth centuries." The portion of the passage that is responsive is at lines 26-34.
Those lines of the passage establish that mainstream U.S. historians took a "nationalist approach" that focused on "the nation-state as a historical force" and created "new myths about the inevitability of nations."
Answer choice (B) reflects a similar kind of "inevitability" - that is, the biographer argues that a novelist's early achievements confirms innate talent.
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