What Is the Primary Basis Upon Which We Divide the Ingredients

What is the primary basis upon which we divide the ingredients of the solar nebula into four categories (hydrogen/helium; hydrogen compound; rock; metal) ?

A) The temperatures at which various materials will condense from gaseous form to solid form.
B) The atomic mass numbers of various materials.
C) The locations of various materials in the solar nebula.
D) The amounts of energy required to ionize various materials.

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