Discussion
Which one of the following explanation may be considered as relatively appropriate for determining intelligence ?
Answer: D
The relatively appropriate explanation is a major contribution of genetic factors and some contribution of environmental factors.
Studies of twins and adoptees show that heredity accounts for a large share of differences in measured intelligence, and the environment, such as nutrition and schooling, accounts for part of the rest. Option (D) states that balance.
The 'negligible environmental' view is too extreme, and 'economic factors' is too narrow. The view that social factors are the main contribution reverses the evidence, so those options are not accepted.
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