Fact 1: Glass cause refraction of light. Fact 2: Prisms are round pieces of glass. Given the two facts above, what do prisms do to light?

Options are: A). focusing a lens; B). Refract it; C). Reflect it; D). protect them; E). Absorb it; F). observe it; G). It expands; H). Diffraction;
The answer is:
B).