Monomers link to form molecules called polymers. A limitless number of polymers can be built from monomers. Which statement BEST explains how such a large number and variety of polymers can be built from monomers?

A. There are a limitless number of monomers that can combine to form polymers.
B. Each time a monomer links with another monomer, a new type of polymer is formed that is unlike any previously formed.
C. Each new polymer has one more monomer linked to it than polymers formed previously; therefore, an infinite number of polymers form.
D. A small set of monomers can come together in a wide variety of ways, forming limitless types of polymers.