Answer:
D. No single age group dominates development.
Step-by-step explanation:
Paul Baltes was a sociologist who was the proponent of the theory that human development is a process that takes place throughout a life-span. Development begins at birth and ends at death.
There is constant development in a person. One age range does not have more development than others.
Hence, the answer to the question is D. No single age group dominates development.