Mary, the manager of an electronics store in Iowa, gives her staff the authority to resolve customer complaints. She lets the staff decide whether to issue refunds or replace merchandise in case of consumer grievances. Which job design technique is Mary implementing in her store?

Job enrichment.

Explanation:

The work design technique that Mary is implementing in her store is the job enrichment  which is a technique that provides greater autonomy to the organization's employees, that is, employees have the possibility to participate in the decision-making process, greater control and greater flexibility to organize your work.

This technique has the main advantage of increasing the motivation of employees, who feel more valued by the organization, more confident in carrying out their function and more capable of innovating and developing their skills and competences.

answer; /// i believe the correct answers are (b) change in population and (e) future expectation of check first, good luck