Which Statement Would BEST Support the Idea That the Interaction

Which statement would BEST support the idea that the interaction of nature and nurture (particularly experience) continues to shape the brain through middle adulthood?

A) Matthew, an ER doctor, is better at making quick decisions than he was as an inexperienced resident.
B) Lilly, a ballet dancer, has decided to teach ballet to children due to her sore knees.
C) Frank, an accountant, studies for a licensing exam that he's taken before and passes it.
D) Madeline earned a promotion at her job for continuing to perform her job well.