Final answer:
As of my knowledge cutoff in January 2022, there is no information indicating that the Mednick Adoption Study involved adopted sons. Therefore, the correct answer is: 1) None
Step-by-step explanation:
The Mednick Study does not specify a number of adopted sons, but it is an investigation that is often associated with the study of behavioral genetics and delinquency, under the realm of psychology. The question may be referring to a different study or contain a misunderstanding of the study's content.
The Mednick Study is known for investigating the role of genetic and environmental factors in the development of criminal behavior by comparing adopted children to their biological and adoptive parents. However, it does not focus on the specific number of 'adopted sons' as part of its primary research question.