Three external factors that can affect a person's resiliency are; family, peers, and community.
Three internal factors that can affect a person's resiliency are; behavior, perception, and attitude.
The answer to your question is 3.4
The study enables scientists to understand the importance of the roles that genes and environment play in intelligence.
<h3>What is inteligience study?</h3>
The term intelligience study has to do with the asessment of individuals to effectively complete a given task in short period of time.
Twins share the same environment hence, scientists can be able to decode the importance of the roles that genes and environment play in intelligence.
Learn more about intelligence:brainly.com/question/9944825
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The correct letter answer is A or C. Choose whichever one you want. I think it's C, but you can consider A also. :)