Most (though not all) researchers believe that observed variations in IQ scores are due to

A) heredity, not environmental factors.
B) environmental factors, not heredity.
C) the combined effects of both heredity and environmental factors.
D) neither heredity nor environmental factors.

The most widely accepted view among researchers is that variations in IQ scores are due to the combined effects of both heredity and environmental factors. While genetics play a significant role in determining IQ, environmental factors such as education, nutrition, parental support, and access to resources also have an impact. It is important to note that the exact proportion of influence from each factor is not yet fully understood, and the debate regarding the relative importance of heredity versus environment in determining intelligence is ongoing.