Final answer:
Daniel Levinson describes mid-life development as a time of transformation and reevaluation, which aligns with the option c) Transformation and reevaluation.
Step-by-step explanation:
The concept best expressing Daniel Levinson's idea about development at mid-life is c) Transformation and reevaluation. Levinson discussed the idea that middle adulthood is characterized by a process where individuals assess their life achievements, and often undergo significant transitions and reassessments. This is different from Erikson's theory, which describes the mid-life challenge as generativity versus stagnation, where individuals strive to contribute to society to avoid a sense of stagnation, and the late adulthood challenge as integrity versus despair, reflecting upon one's life with a sense of satisfaction or a sense of failure.