The correct answer is D. salary.
Hygiene factors are factors that are necessary for employees to be satisfied with their jobs, but they do not motivate employees to perform at a high level. These factors include salary, benefits, working conditions, and job security.
Achievement is a motivator that refers to the satisfaction that employees get from completing tasks and achieving goals. Recognition is a motivator that refers to the appreciation that employees receive for their work. Advancement is a motivator that refers to the opportunity for employees to move up in their careers.
Salary is a hygiene factor because it is necessary for employees to meet their basic needs. However, salary is not a motivator because it does not provide employees with a sense of satisfaction or accomplishment.