Herbert, an HR Manager at Maxtier Inc

Herbert, an HR manager at Maxtier Inc., hires 50 employees in five months. He used different sources of recruitment to recruit these employees. He wants to know which kind of source delivered the most new hires for the money. To answer that question, Herbert should determine the

A) hiring conversion rate.
B) prospective cost.
C) return on investment.
D) yield ratio.
E) cost per hire.