According to Descartes' "Treatise of Light" the Entire Physical Universe

According to Descartes' "Treatise of Light" the entire physical universe is made up of:

A) fire, air, water, and earth.
B) invisible particles of "heat," invisible particles of "light," and visible particles of material "earth."
C) material particles separated by void.
D) several kinds of elementary atoms which should combine to form an almost infinite variety of different compounds.