Explanation
Correct answer: B.
Choice B is the best answer. Both texts are critical of The Guns of August, but for different reasons: the author of Text 1 argues that Tuchman missed an important factor leading up to the war because she didn’t consult secondary sources, and the author of Text 2 argues that Tuchman’s main thesis is "reductive," which is a close synonym for "overly simplistic."
Why the other choices are wrong
Choice A
Choice A is incorrect. This doesn’t accurately describe the difference. This choice’s summary of Text 1 is accurate, but Text 2 never says that Tuchman’s most interesting claims result from her original research.
Choice C
Choice C is incorrect. This doesn’t accurately describe the difference. Text 1 never says that The Guns of August is worthwhile to read despite its research weaknesses. Text 2 does call out a weakness of Tuchman’s interpretation of events, but it also praises her analysis of primary sources.
Choice D
Choice D is incorrect. This doesn’t accurately describe the difference. Text 1 actually says that Tuchman "fails to address" the influence of events in Eastern Europe, while Text 2 says that Tuchman’s thesis was that European powers (not Eastern European leaders) were committed to military plans.