The Buraku people of Japan, who are looked down upon by other Japanese and whose IQ scores are 10 to 15 points below mainstream Japanese, illustrate the fact that:

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The Buraku people of Japan illustrate that social discrimination can affect IQ scores. This suggests that IQ scores are not solely determined by genetic factors or fixed at birth, and that environmental factors can have an impact on IQ scores. Therefore, option C is the best choice. Option A is incorrect because it suggests that IQ scores are solely determined by genetics. Option B is incorrect because it suggests that IQ scores cannot change over time. Option D is incorrect because it suggests that environmental factors have no impact on IQ scores.

The Buraku People of Japan, Who Are Looked Down Upon