Language laboratory is the place where the learners have to listen on headphone. The language labs are set up with a view to provide listening activities in order to develop—

Language laboratories provide structured listening activities where learners hear correct pronunciation, intonation, and speech patterns through headphones, then practice speaking. The primary aim is to develop speech habits—correct pronunciation, fluency, and oral communication skills—by listening to native or model speakers and imitating them. While listening is the medium, the goal is developing speaking/speech habits. Hence (2) speech habit is correct.