A local department store hires college students for one month every spring to audit its unsold inventory. It costs the department store 20 percent less to pay wages to students than it would cost to hire outside auditors from a temporary service. Even after factoring in the costs of training and insuring the students against work-related injury, the department store spends less money by hiring the student auditors than it would by hiring auditors from the temporary service.

The statements above, if true, best support which of the following assertions?

(A) The amount spent on insurance for college-student auditors is more than 20 percent of the cost of paying the college students' basic wages.

(B) It takes 20 percent less time for the college students to audit the unsold inventory than it does for the outside auditors.

(C) The department store pays its college-student auditors 20 percent less than the temporary service pays its auditors.

(D) By hiring college students, the department store will cause 20 percent of the auditors at the temporary service to lose their jobs.

(E) The cost of training its own college-student auditors is less than 20 percent of the cost of hiring auditors from the temporary service.

OA [spoiler](E)[/spoiler]