Final answer:
Successful aging, as described by Ballets and colleagues, includes the concepts of selection, optimization, and compensation, which are part of the selective optimization with compensation theory.
Step-by-step explanation:
According to Ballets and his colleagues, successful aging is based on selection, optimization, and compensation. The correct answer to the question is compensation. This concept is part of the selective optimization with compensation theory, which focuses on successful personal development throughout the life course and mastery of challenges associated with everyday life. The theory emphasizes the importance of balancing the losses of aging with gains, acknowledging that the goals, or compensation, are specific to the individual.