In what situation might someone use a 'filibuster'?

A filibuster is a parliamentary procedure that is used to prolong debate and delay or prevent a vote on a piece of legislation. This tactic is often employed by senators or parliamentary members who wish to block a decision by extending discussion about the bill at hand. The primary aim of a filibuster is to slow down legislative progress, particularly when the opposing party holds a minority position and wants to challenge the majority's agenda.

In this context, the choice focusing on delaying a vote on legislation is the correct response, as it accurately encapsulates the strategic use of this tactic in legislative bodies, especially in the U.S. Senate, where it has become a notable feature of political maneuvering. The other choices describe actions that do not align with the nature of a filibuster; for instance, concluding a session quickly, gathering support, or presenting final arguments do not reflect the intent or outcome of using a filibuster.