Question

which example best illustrates that light behaves like particles?
light bends as it strikes a window.
light bounces off a white cement sidewalk.
light travels in space at a speed of about 3.0 x 10^8 m/s.
light increases in speed as it moves through matter.

Explanation:

The photoelectric effect and light - particle interactions like reflection are evidence of light's particle - like behavior. When light bounces off a surface (reflection), it can be thought of as particles (photons) colliding and changing direction. Bending of light is related to refraction (wave - like behavior in some contexts), light speed in space is a general property, and light speed change in matter is related to refraction and interaction with the medium's atoms, not a clear - cut particle behavior example.

Answer:

Light bounces off a white cement sidewalk.