It Is Now Thought That Most Elements in the Universe

It is now thought that most elements in the universe heavier than iron in the periodic table:

A) are produced by the nuclear reactions in the central cores of high-mass stars a few hundred years before the star explodes into a supernova.
B) were produced in the Big Bang explosion at the beginning of our universe.
C) are produced by the successive capture of high-speed neutrons within low-mass star cores because neutrons are uncharged and can approach other nuclei without electrostatic repulsion.
D) are produced by nuclear reactions in the shock wave regions surrounding supernova explosions.