Question

black objects absorb all the colors of visible light. what do white objects do?
they reflect all colors of light.
they split light apart.
they absorb all colors of light.

Explanation:

When an object is white, all of the colors of visible light are reflected and none are absorbed. This is in contrast to black objects which absorb all colors of visible light. Splitting light apart is what a prism does (related to dispersion), not what white objects do.

Answer:

They reflect all colors of light.