Which of the following is the best indicator of internal recruitment effectiveness?

The Promotion Ratio measures the proportion of vacancies filled through internal promotions. A higher promotion ratio generally indicates that the organization has successfully developed its employees and maintained an effective internal talent pipeline. Why the other options are incorrect A. Number of external advertisements-Indicates external recruitment efforts, not internal recruitment effectiveness.  C. Number of interviews-Reflects recruitment activity but not the success of internal hiring.  D. Cost per hire-Measures recruitment efficiency in financial terms, regardless of whether hiring is internal or external.  E. Campus visits-Relate to external recruitment of fresh graduates.