SAT Question 571cf537: Words In Context answer and explanation

English - Words In Context - Fill In Blank Single Word
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The author’s claim about the relationship between Neanderthals and Homo sapiens is ______, as it fails to account for several recent archaeological discoveries. To be convincing, his argument would need to address recent finds of additional hominid fossils, such as the latest Denisovan specimens and Homo longi.
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Difficulty:Hard
Which choice completes the text with the most logical and precise word or phrase?