Select the correct answer.

Who best exemplifies the traits of a lifelong learner?

A. Elvira has a high school diploma; she is content with her job at the local florist, and she has no further career ambitions.
B. Harold works in a hotel; he hates his job but does whatever his manager asks him to do.
C. Jonathan works as a cashier; he enrolled in a part-time course in accountancy, and he pays keen attention to all aspects of his job.
D. Olga has been teaching for a few years; she does not attend the annual teacher conferences because she thinks she has enough experience.
E. Yuan works at an insurance company; he wants to advance in his career but avoids attending all company training programs.