Which of the following is an action described as "default"?

The term "default" in a legal context specifically refers to the failure to fulfill a legal obligation or duty. This can occur in various circumstances, such as failing to comply with the terms of a contract or not appearing in court when required. When a party defaults, it can lead to various legal consequences, such as the court ruling in favor of the non-defaulting party or the imposition of penalties.

Options that involve positive actions, like winning a court case, submitting evidence, or paying legal fees, do not align with the concept of default since they all reflect compliance or fulfillment of legal responsibilities. Therefore, the correct answer clearly illustrates the nature of default as a failure to meet legal obligations.