Which of the following is an example of a commercial establishment?

A commercial establishment primarily refers to a business that operates to make a profit by providing goods or services to customers. In this context, a fast food restaurant is a clear example of a commercial establishment because it is designed to generate profit through the sale of food to the public.

The other options typically do not operate with the primary goal of profit in the same way a fast food restaurant does. A guest house can be considered commercial as it provides accommodation and aims to earn revenue from guests. In contrast, a community kitchen often focuses on providing food and cooking resources for community members rather than generating profit. Similarly, a farmers market serves as a venue for local farmers to sell their produce, but it often operates more as a community service rather than a straightforward commercial enterprise, especially if it supports local agriculture and small-scale producers.

Thus, the fast food restaurant serves as the most concrete example of a commercial establishment within the provided options, as it consistently focuses on profit and operates in a competitive market.