Henry's Father Was a Lower-Level Manager of a Department Store

Henry's father was a lower-level manager of a department store. Meanwhile, Henry was able to go to college and get his master's degree in business administration, and now is a district manager overseeing all department stores that operate on the West Coast. This is an example of ________.

A) social mobility
B) individual-level factors
C) resiliency
D) ascribed status
E) proletariat