Isolated Main-Sequence Stars as Massive as 10 to 12 Times

Isolated main-sequence stars as massive as 10 to 12 times the mass of the Sun may still manage to avoid going supernova. Why?

A) Because they can also have strong stellar winds
B) Because about half that mass will be contained in the carbon core
C) Because they would be classified as brown dwarfs
D) Because these stars will eject at least 4 solar masses in the planetary nebula stage
E) Because their masses will decrease as they fuse heavy elements into lighter elements in their cores