Answer:
Option D, .Greater than that between ordinary siblings reared together
Step-by-step 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