Which statement BEST reflects research on multiple ethnicities during the late 20^th Century?

Question

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Research during the late 20th and early 21st century has shown that individuals with higher education and younger age tend to have higher rates of multiple ethnicities. Reports of multiple ethnicities have not declined and research on this topic has not been studied for centuries. While some studies suggest that individuals with multiple ethnicities may have higher life satisfaction, this is not a universal finding and more research is needed to fully understand the relationship between ethnicity and well-being.

Which Statement BEST Reflects Research on Multiple Ethnicities During the Late