What Has Been Found in Longitudinal Studies That Examine the Stability

What has been found in longitudinal studies that examine the stability of personality across the lifespan?

A) Personality doesn't change much after age 30, and even less after age 50.
B) Personality tends to go through cyclic reversals every decade or so.
C) Personality is stable from the time we reach adolescence, as Freud suggested.
D) Personality should be thought of as a 'state' rather than as predictable traits.