Which Event Represents a Quantum Change in Personality

Which event represents a quantum change in personality?

A) Ronald, who wants to lose weight, commits to a diet plan and sticks to it.
B) Vernon, unhappy in his job, decides to enroll in continuing education courses.
C) Emily, a lifelong drug abuser, finally decides to get sober at age 52.
D) Zelda, who is an undeclared major, takes courses in sociology to explore her interests.