Which of the following provides the strongest evidence of the role of heredity in determining intelligence?

A) The IQ scores of identical twins raised separately are more similar than those of fraternal twins raised together.

B) The intelligence scores of fraternal twins are more similar than those of ordinary siblings.

C) The intelligence scores of identical twins raised together are more similar than those of identical twins raised apart.

D) The intelligence scores of adopted children show relatively weak correlations with scores of adoptive as well as biological parents

A) The IQ scores of identical twins raised separately are more similar than those of fraternal twins raised together.

Explanation:

Role of heredity in determining intelligence: In psychology, several research has been one of the relation between heredity and environment in determining the intelligence of an individual. Researchers have identified that twins' studies were the most successful in identifying the IQ scores as they share the same genetic material.

According to the researcher, genetics plays a more important role as compared to the environmental factors and therefore in determining intelligence genetics play 60% of the role whereas 40% is the environmental factors.