Democritus Put Forth the Concept of an Atom Because

Democritus put forth the concept of an atom because

A) of experimental evidence from his laboratory.
B) older ideas that he borrowed from Egyptians.
C) he observed rocks turning into pebbles and then turning into sand.
D) his invention of the magnifying glass led him to think about progressively smaller particles.
E) it was philosophically satisfying that there would ultimately be a size limit on particles.