Clement,the Director of HR for a Large Advertising and Public

Clement,the director of HR for a large advertising and public relations firm with multiple global locations,is facing all of the following situations.All of these situations will decrease the accuracy of his estimate of the internal supply of labor for various jobs at the firm EXCEPT

A) more female college graduates are being hired.
B) layoffs have occurred in several locations.
C) backup candidates for promotion move to competitor firms or start their own firms.
D) fewer employees take retirement than expected.