What Is the Source of MOST of the Heavy Elements

Multiple Choice

What is the source of MOST of the heavy elements on Earth and in our own bodies?

A) thermonuclear fusion reactions in the cores of massive stars before the supernova phase
B) explosive nucleosynthesis during supernova explosions of massive stars
C) vosmic ray interactions with hydrogen and helium nuclei in interstellar clouds
D) nuclear reactions during the formation of the universe (the Big Bang)