Answer:
d. Improve task significance.
Step-by-step explanation:
Job characteristics theory has to do with work designs aimed at enriching jobs of employees in the workplace.
Five core job characteristics are considered: task identity, skill variety, task significance, autonomy, and feedback.
These job characteristics affects 5 work related outcomes: satisfaction, motivation, absenteeism, turnover, and performance.
In the given instance where employees take their task of serving customers very seriously but feel like the work they do is very important, there is a need for improvement of task significance.
This can be done through regular sensitisation training on the impact their services are having on the profit base of the company and also on customer satisfaction.
With the knowledge that their efforts are making a difference they will feel more satisfaction from their work.