What action should be taken when additional discovery is needed in a lawsuit?

When additional discovery is needed in a lawsuit, arguing that more time is required for discovery and providing a declaration is the appropriate course of action. This option allows a party to formally request an extension or additional time to gather requisite evidence, which is crucial for adequately presenting their case.

The declaration serves as a written statement attesting to the reasons why additional discovery is necessary, helping to establish the justification for the request. It ensures that the court understands the underlying circumstances prompting the need for further information, such as difficulties in obtaining documents or scheduling depositions.

The other options do not effectively address the need for additional discovery. Requesting a dismissal of the case does not facilitate the discovery process and would likely undermine the party's position. Proceeding with trial without the necessary evidence could jeopardize the case, as it may result in an inability to adequately support claims or defenses. Changing the attorney may introduce new strategies but does not provide a solution for obtaining the needed discovery in a timely manner.