Which of the following statements about private employment agencies is TRUE?

A) Due to hidden intangible costs, they can only serve professional, managerial, but not unskilled job applicants.
B) They can provide unskilled applicants whom employers would have a difficult time finding.
C) Due to privacy and competitive issues, they play only a minor role in recruiting professional and managerial candidates.
D) All of the above are true.
E) None of the above are true

Private employment agencies can provide unskilled applicants whom employers might have difficulty finding on their own. Options A and C are incorrect as private employment agencies can serve both skilled and unskilled job applicants, and while privacy and competitive issues may sometimes limit their role in recruiting professional and managerial candidates, it is not always the case. Option D is incorrect as only option B is true. Option E is therefore incorrect as well.