When a Star Undergoes a Nova Explosion, It May Return

When a star undergoes a nova explosion, it may return to its "quiet state" and later become a nova again. What would allow a nova explosion to happen to a star more than once?

A) the star that goes nova collides with several stars in a star cluster
B) the star that goes nova has a companion star near it, which dumps material onto the first star and continues to do so even after the first nova explosion
C) the star that goes nova has a number of massive planets around it which fall in
D) the star that goes nova has an iron catastrophe in its core and then another step in the fusion of heavy elements producer another explosion
E) a nova explosion happens each time a neutron star rotates to face us, and that happens every century or so

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