The Index Scores of the WAIS-IV,representing the major ability factors that underlie the subtest scores,are

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The Index Scores of the WAIS-IV are Verbal Comprehension, Perceptual Reasoning, Working Memory, and Processing Speed. These four factors cover the major abilities that underlie the subtest scores. Choice A is incorrect as it includes some subtests rather than factors. Choice C is incorrect as it only includes processing speed and ignores the other three factors. Choice D is out of date as the WAIS-IV no longer uses the Verbal and Performance scales; instead, it uses the four Index Scores mentioned in choice B.

The Index Scores of the WAIS-IV,representing the Major Ability Factors