In the given sentence, the speaker wishes the employee to be prompt. It means that they want the employee to try harder to be on time. Thus, option B is correct.
Prompt is a word used in reference to quick, fast, and speedy movement that allows the person to work immediately without showing any delay.
In the given sentence the supervisor asks the employee to be prompt at work as if asking them to be more speedy and fast showing their work done to be completed at the targeted times.
Therefore, option B. trying hard to be on time is the correct meaning of the word prompt.
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