Which of the Following Is True of the Elgin Marbles

Which of the following is true of the Elgin marbles?

A) They were willingly given to the British museum by Greece because Greece at the time could not protect them from damage cause by pollution; however, Greece now wants them back.
B) They were stolen from Greece by the British Museum, and the British Museum refuses to return them.
C) They were legally purchased from Lord Elgin by the British Museum; however, there is much controversy over whether Elgin's acquisition of them was ethical, and whether or not the marbles should be returned to Greece.
D) The British Museum has finally returned them to Greece in the spirit of "the unity of the European cultural heritage."