Final answer:
The correct answer is Option B. genetic, as studies have shown that genetics control a significant aspect of intelligence levels and contribute to the variation in IQ scores.
Step-by-step explanation:
The correct answer is option b) Genetic. This is because research has shown that while environmental factors provide stability and change to trigger manifestation of cognitive abilities, genetics still control a significant aspect of intelligence levels. According to the theory of Range of Reaction, our genetic potential is fixed, but environmental factors determine whether we reach that potential. Furthermore, the correlations of IQs also suggest a genetic component to intelligence, which would result in higher standard deviations in IQ scores among genetically diverse groups.
Randomly sampled sets of genetic IQ scores are likely to have the highest standard deviation due to the genetic component of intelligence. While environmental and cognitive factors also play a role in intelligence, it is the variation in genetic factors that is likely to result in a higher standard deviation among IQ scores.