What Happens to a Copyrighted Work After It Has Finished

What happens to a copyrighted work after it has finished its copyright period?

A) The work will enter the public domain to be used for free.
B) A non-copyright holder can purchase the rights to the work.
C) The copyright can be renewed for a fee by the original creator of the work.
D) The government takes over ownership of the work, and provides it to the public domain for a fee.