What Can We Conclude About the Development of Dispositional Traits

What can we conclude about the development of dispositional traits across adulthood?

A) Personality traits remain stable when the data are averaged across many different kinds of people.
B) Personality traits remain stable but only when examining specific personality traits in specific kinds of people.
C) When the data are averaged across many different kinds of people, the research overwhelmingly points to personality change over time.
D) It has become apparent that we do not have adequate measures to assess personality trait stability and change over time.