In life span development patterns of growth, change, and stability are examined which occurs during the life span of a person. It is very important to study life span development because it provide information about how our brain develops and at what stage it becomes fully mature.
This maturity research can be used by lawyers to prove that a person is totally responsible for the offense he/she committed or not. Physical, social, personality and cognitive development are deeply studied in the area of lifespan development. So the correct answer is A.