Due to efficiency concerns, store management is thinking about pulling

Due to efficiency concerns, store management is thinking about pulling employees from longer, eight-hour shifts and assigning them to shorter shifts of four or five hours, coinciding with periods of peak customer traffic. It makes little sense to change schedules like this, however, as studies have shown that customers are less satisfied when they shop at stores whose employees work abbreviated hours.
A customer unsatisfied when shopping during peak hours is unlikely to remain a customer for very long.
Which of the following, if true, most strengthens the argument given?

A. An employee who works exclusively during peak hours will usually perform her job to the best of her abilities, regardless of whether her hours are abbreviated.

B. Even when they are aware of abbreviated hours, customers express little interest in the ways the stores they shop at are managed.

C. Employees working abbreviated hours often feel slighted by their employers and become less motivated to do their jobs well as a result.

D. The employees who quit after having their hours reduced are often the employees who score the lowest on their annual performance evaluations.

E. Customer satisfaction has a negligible impact on rates of customer retention