The similarity between the intelligence test scores of identical twins raised apart is
a. less than that between children and their biological parents
b. equal to that between identical twins reared together
c. equal to that between fraternal twins reared together
d. greater than that between ordinary siblings reared together
e. equal to that between adopted siblings reared together

Option D, .Greater than that between ordinary siblings reared together

Explanation:

Since, studies related with twins, family members, and adopted children have already established that genetic contribute to intelligence.

The correlation between the verbal abilities of adopted children and their adopted parents is marginal as they do not share a genetic history.

Therefore, Fraternal twins raised together show higher level of similarity in intelligence scores than the identical twins that are raised apart.

Since identical twins have similar genetic code therefore, similarity between the intelligence test scores of identical twins  will be higher as compared to the similarity between the intelligence test scores of ordinary siblings reared together