Evidence for interindividual variability in intelligence is best demonstrated when

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Interindividual variability in intelligence refers to the fact that intelligence levels can vary between individuals. The statement that one individual's reasoning skills improve with age while another's decline with age is a clear demonstration of interindividual variability in intelligence because it shows that people can differ in their cognitive abilities even as they age. Choice A is incorrect because it describes a test that assesses many different abilities, but it does not necessarily demonstrate interindividual variability. Choice B is incorrect because it describes within-person variability, which is not the same as interindividual variability. Choice C is also incorrect because it describes a skill-specific improvement that may not be related to overall intelligence.

Evidence for Interindividual Variability in Intelligence Is Best Demonstrated When