In the following examples, who is experiencing downward social mobility in the United States?

A. Apone, a lawyer, has decided to quit her law practice to become an elementary school teacher.
B. Enyeto, a member of Congress, has decided to retire and return to his family farm.
C. Senaka, member of a wealthy family, is now the first person in his family not to go to college.
D. All of the above are true.