A Major Reason Workers Tend to Receive Fewer Promotions Than

A major reason workers tend to receive fewer promotions than in the past is that:

A) firms have found that promoting employees can create jealousy and resentment among the workers who are not promoted.
B) very few of today's supervisors and lower-level managers have the qualifications needed to move into higher management positions.
C) most firms now believe hiring people outside the organization is a better way to fill management positions because it brings in "new blood."
D) there has been a movement toward flatter organizational structures,so there are fewer opportunities to move upward.