Free SAT Practice Question

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ID: DSAT-RW-II-012
Section: Digital SAT Reading & Writing (RW) - Broadly Reading - Information and Ideas
Topic: Inferences
Difficulty level: Medium

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In a study of the problem-solving abilities of New Caledonian crows (Corvus moneduloides), researchers failed to control for the mechanical difficulty of the devices used. Some birds were given tasks requiring little force or dexterity, such as lifting a light lid to reach food; others faced physically demanding setups, such as pulling up a weighted bucket by a knotted string. Performances on these unequal tasks were judged by the same criteria. The results of the study, therefore, __________

Which choice most logically completes the text?

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