There appears to be a "glass ceiling" that

A) allows supervisors to evaluate the potential of their subordinates.
B) prevents white males from succeeding in traditionally female-oriented jobs.
C) prevents most women and ethnic minorities from advancing beyond middle management.
D) allows women and ethnic minorities to be trained for jobs in upper management.

The term "glass ceiling" refers to an invisible barrier that prevents women and minorities from advancing beyond middle management in organizations. This suggests that the best answer is C - the glass ceiling prevents most women and ethnic minorities from advancing beyond middle management. Option A is incorrect as it is not necessarily related to the concept of the "glass ceiling." Option B is also incorrect as it only pertains to a specific demographic (white males) and specific industries. Option D is not accurate as the "glass ceiling" is not a tool to help women and ethnic minorities advance to upper management.