To What Does the Term Velvet Divorce Refer

To what does the term velvet divorce refer?

A) The collapse of Czechoslovakia into the separate nations of the Czech Republic and Slovakia.
B) The political disenchantment of citizens in the former East and West Germany with reunification.
C) Slovenia's secession from the federal state of Yugoslavia.
D) The process by which Mikhail Gorbachev was ousted as leader of the Soviet Union.
E) The dissolution of Poland into two distinct nations after the fall of the Berlin Wall.