Answer: The theory that the Americas were populated by humans crossing from Siberia to Alaska across a land bridge was first proposed as far back as 1590, and has been generally accepted since the 1930s.
Explanation:
The right answer is D. genetics. In this case, Kelly has been exposed to so many environmental situations and family at risk that explains criminal behavior and drug use. Living in a home or neighborhood where criminal activities are carried out, little family support and drug use from a young age explain their behavior.
I hope this answer can help you.