What Prevents a Star from Having a Mass Greater Than

What prevents a star from having a mass greater than about 200 M ? ?

A) No interstellar clouds are found that contain more than 200 M ? .
B) A star of larger mass would collapse under its own gravity, and the whole star would become a black hole.
C) Gas pressure becomes so high as a consequence of high temperatures that the excess mass is pushed back into space.
D) The core of a larger-mass star would evolve rapidly and explode before the overall star finished contracting as a protostar.