Family studies, twin studies, and adoption studies are primarily designed to

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Family studies, twin studies, and adoption studies are all methods used to investigate the relative contributions of genetics and environment to behavioral traits. By examining families, identical and fraternal twins, and adopted individuals, researchers can identify similarities and differences in behavioral traits that can help to disentangle the effects of genetics versus environmental factors. Choice B is incorrect because these studies are not designed to establish the groundwork for genetic engineering programs. Choice C is also incorrect because while these studies do demonstrate the empirical nature of psychological research, this is not their primary purpose. Choice D is incorrect because these studies are not primarily designed to assess the effects of modern child-rearing methods, although they may provide some insight into this area.

Family Studies, Twin Studies, and Adoption Studies Are Primarily Designed