An Intervention Study Designed to Improve Family Communication and Cohesion

An intervention study designed to improve family communication and cohesion between parents and their sons (Brody et al., 2009) revealed that the sons' DNA was important to the outcome. Which statement was a finding from the study?

A) The intervention had an impact on boys with a long allele of the 5-HTTLPR gene.
B) The intervention had an impact on boys with a short allele of the 5-HTTLPR gene.
C) The control experience had an impact on boys with a long allele of the 5-HTTLPR gene.
D) The control experience had an impact on boys with a short allele of the 5-HTTLPR gene.

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