Which event causes the formation of the electric current produced by the photoelectric effect?
A. Electrons flow in waves from one atom to another when light
strikes them.
B. The waves of light cause electrons to flow in different directions
within an atom.
C. Electrons are knocked off the surface that the light strikes by
"particles of light
D. Electrons are particles, so they flow through the air from a light
bulb to a metal surface.