Which of the following options does not represent a type of durable good?

A durable good is defined as a product that does not wear out quickly and provides utility over time—typically lasting three years or more. The options representing durable goods, such as washers and dryers, furniture, and automobiles, all have a long lifespan and are intended for extended usage.

A toothbrush, however, is designed for short-term use and is typically replaced regularly; it does not meet the criteria of durability or prolonged utility as seen with the other items listed. Therefore, it distinctly fits into a category of non-durable goods, which are consumed or used up quickly. This is why a toothbrush is correctly identified as not representing a type of durable good.