选择题：The best statement of the main idea of this passage is that ______.

题目内容：

The best statement of the main idea of this passage is that ______.

A. human brains differ considerably

B. the brain a person is born with is important in determining his intelligence

C. environment is crucial in determining a person's intelligence

D. a person who is handicapped environmentally will never attain the level of intelligence of which he is capable

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