PART A: Which of the following identifies the main claim of the text? A. Genetics do not have any detectable impact on a person’s individual happiness, as scientists previously believed. B. By actively attempting to be happier more often, people can improve their set point of happiness. C. While genetics may determine a person’s range of happiness, individual choices have a significant impact on happiness levels. D. Individual choices can influence a person’s happiness levels, but the effects they have on overall happiness are insignificant in comparison to the effects of genetics.