In general, what is true of very massive stars (those with eight or more solar masses)?
A. They have so much more hydrogen fuel than low-mass stars that it takes them much longer to use it up than stars with less mass.
B. They skip the hydrogen-burning stage altogether and start their lives fusing iron.
C. They go through their hydrogen fuel supply much more quickly than low-mass stars.
D. All of them have already gone supernova.