When considering the issue of supplying personnel to meet organizational demand,what aspects must be considered?

A) current employees and individuals previously employed by the organization
B) internal HR supply and individuals who receive training for subsequent promotion
C) internal and external human resource sources
D) preferential consideration to the internal workforce through promotions and training

When considering the issue of supplying personnel to meet organizational demand, it is important to consider both internal and external human resource sources. This allows for a wider pool of candidates to select from and makes it more likely that the best candidates are identified and selected for positions. While consideration of current employees and training for promotions is also important, it is not the only aspect that should be considered. Therefore, option C is the best choice as it includes both internal and external sources of personnel.