Which of the following words most closely means to stall by excessive talking?

The word that most closely means to stall by excessive talking is filibuster.

Here's why:

* Filibuster is a tactic used in legislative bodies, particularly in the United States Senate, where a single senator or group of senators can delay or prevent a vote on a bill by continuously speaking.

Let's look at the other options:

* Obscure means to make something difficult to understand or see.

* Obfuscate means to make something unclear or confusing.

* Confront means to face someone or something directly.

While these words might relate to communication in some way, they don't specifically describe the act of stalling by talking excessively.