Can a White Dwarf Explode

Can a white dwarf explode?

A) Yes, but only if another star collides with it; stars are so far apart in space that this is unlikely ever to have happened in the Galaxy.
B) Yes, but only if it is in a binary star system.
C) Yes, but only if nuclear reactions in the white dwarf core reach the stage of silicon fusion, producing iron.
D) No. White dwarfs are held up by electron degeneracy pressure, and this configuration is stable against collapse or explosion.