What action had the speaker taken regarding the sofa?

The speaker had taken action by planning to move the sofa, which indicates a future intention rather than a completed action. This choice highlights the speaker's intention or decision-making process about the sofa rather than any physical interaction that has already occurred with it. It signifies that the speaker has thought about or arranged to undertake the action of moving in the near future.

Other choices describe different levels of physical interaction with the sofa. Selling it would mean the sofa is no longer in the speaker's possession, moving it suggests a physical action that has already been completed, and lifting it focuses on the act of picking it up. However, only planning to move it encapsulates the idea of preparatory action without confirming whether the action has yet taken place.