Discussion
A person's intelligence is determined fundamentally by
Answer: D
The keyed answer is nerve cells in the cortex.
The cerebral cortex, the outer layer of the brain, is the seat of the higher mental functions that intelligence tests measure: reasoning, memory, language and problem-solving. These depend on its neurons and the connections between them, which is why the key points to the nerve cells of the cortex.
Brain size and weight are poor guides: an elephant's or a whale's brain is far heavier than a human's, and human brains vary widely in size without matching differences in ability. Since one option is supported, 'None of these' is wrong. (Heredity and environment shape how the cortex develops, but they are not among the options.)
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