Explanation
Correct answer: B.
Choice B is the best answer. “More often” logically signals that the historical outcome in this clause—dust bowl migrants’ relocation within the Great Plains region—was more common than the movement to California described in many historical accounts.
Why the other choices are wrong
Choice A
Choice A is incorrect because “for this reason” illogically signals that the historical outcome in this clause was caused by either the narrative about widespread movement to California or the 2016 study’s complication of that narrative. Instead, dust bowl migrants’ regional relocation was found to be more common than the movement to California described in many historical accounts.
Choice C
Choice C is incorrect because “additionally” illogically signals that the historical outcome in this clause merely adds to either the narrative about widespread movement to California or the 2016 study’s complication of that narrative. Instead, dust bowl migrants’ regional relocation was found to be more common than the movement to California described in many historical accounts.
Choice D
Choice D is incorrect because “nevertheless” illogically signals that the historical outcome in this clause is true despite either the narrative about widespread movement to California or the 2016 study’s complication of that narrative. While the findings about dust bowl migrants’ regional relocation did challenge the previous narrative, they did not challenge the study’s findings, and this choice creates a confusing ambiguity. Instead, dust bowl migrants’ regional relocation was found to be more common than the movement to California described in many historical accounts.