According to Campbell's model of job performance, which of these is the BEST example of maintaining personal discipline?

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Maintaining personal discipline refers to an individual's ability to manage their time, prioritize tasks, and focus on the necessary goals. Choice A exemplifies this by showing the tour guide taking her personal time during the lunch break to read and improve her knowledge, which would translate into better work performance for the tour guide in the future. The other options do not clearly demonstrate personal discipline. The chemist, in option B, may simply be performing a routine task, and the sales representative, in option D, is merely presenting progress on predetermined goals. The piano teacher, in option C, only performed a task expected of him to collect payment for services rendered, which does not necessarily demonstrate personal discipline.

According to Campbell's Model of Job Performance, Which of These