Main-Sequence Stars Do Not Have Masses Larger Than About 200

Main-sequence stars do not have masses larger than about 200 M ? The reason that stars of larger mass do not exist is that:

A) nothing can prevent such stars from collapsing directly into black holes.
B) the thermonuclear reactions in such stars proceed so rapidly that the star explodes.
C) such stars contract directly to become planet-like objects.
D) they rapidly become very luminous and are quickly disrupted by the resulting very high internal pressure.