Alexander Stone III Was the Chief Executive Officer (CEO) of Acme

Alexander Stone III was the Chief Executive Officer (CEO) of Acme Manufacturing Company. When Alex Stone IV graduated from college, he was appointed Senior Vice President of the Corporation (even though he had no knowledge of the business) . When Mr. Stone III died, the board of directors demoted young Alex to messenger boy. Alex IV thus experienced

A) caste busting.
B) horizontal mobility.
C) loss of face.
D) vertical mobility.
E) unintentional mobility.