Behavioral geneticist Robert Plomin has found that

Question

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According to the passage, Robert Plomin found that the existence of a shared environment accounts for little of the variation in children's personalities or interests. This means that factors operating within the family environment do not impact children equally and that nonshared environments have a greater influence on siblings than shared environments. Choice A is incorrect because Plomin's findings suggest that parents do not treat all their children the same, which is why nonshared environments have a greater impact. Choice B is incorrect because Plomin's research found that not all factors within the family environment impact children equally. Choice C is incorrect because Plomin's findings suggest that the effect of shared and nonshared environmental influences can be discerned in non-identical twins as well as identical twins.

Behavioral Geneticist Robert Plomin Has Found That