Final answer:
Longitudinal research is the ideal method to study developmental changes in personality over adulthood, offering valuable insights into how personality evolves with age.
Explanation:
Longitudinal research would be the best research method to examine developmental changes in personality throughout adulthood. This method involves studying the same group of individuals repeatedly over an extended period of time, allowing researchers to track changes in personality as individuals age.
For example, a researcher could assess individuals' personality traits at different points in their lives, such as at 20, 30, and 40 years old, to understand how personality evolves over time. Longitudinal research provides valuable insights into how personality changes with age while controlling for individual differences.
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