What Is the Overall Composition, According to the Number of Atoms

Multiple Choice

What is the overall composition, according to the number of atoms, of the outer atmospheric regions of Jupiter in terms of the relative numbers of atoms?

A) 75 percent hydrogen, 15 percent helium, and 10 percent everything else
B) hydrogen and helium only, with no other elements
C) 86 percent hydrogen, 13 percent helium, and 1 percent everything else
D) pure hydrogen