What Two Reasons Best Explain Why Many High-Level Political Appointees

What two reasons best explain why many high-level political appointees only work for the government for short periods of time?

A) They leave to obtain advanced degrees and join the armed forces.
B) They leave to obtain advanced degrees and travel abroad.
C) They leave to travel abroad and because they do not like being in the public eye.
D) They leave because of financial difficulties incurred by taking their government posts and because they do not like being in the public eye.
E) They leave because of financial difficulties incurred by taking their governments posts and to obtain advanced degrees.