What Is the Ultimate Cause of Differences in Intelligence from One

What is the ultimate cause of differences in intelligence from one person to another?

A) Variations in intelligence are nature's way of eliminating unfit individuals.
B) It is plausible that differences in intelligence are the result of many factors, including an important contribution from an individual's genotype.
C) Variations in intelligence are unreliable, and thus the ultimate cause cannot be determined.
D) There is no evidence that variations in intelligence are inherited.

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