One Reason Given for More Central Bankers Releasing Its Decisions

One reason given for more central bankers releasing its decisions publicly is:

A) for monetary policy to work, people must be taken by surprise.
B) most people do not understand monetary policy so it really doesn't do any harm to release the decisions publicly.
C) so that central banks across the world can coordinate their policies.
D) monetary policy is more effective when households and businesses can understand and anticipate it.