How Do Countries Like Finland and Singapore Avoid Corruption Within

How do countries like Finland and Singapore avoid corruption within their public administration when corruption seems to plague nearly all bureaucracies?

A) They have scaled back on the number of bureaucrats, allowing for fewer officials to commit heinous acts.
B) Both countries have a lower number of regulations compared to other countries around the world.
C) Their professional bureaucrats do not make public policy, they only carry out laws established by elected officials.
D) The cultures of these countries place a great emphasis on public service, allowing them to keep corruption out of their administration.