Which phrase is the most appropriate for starting a formal presentation?

The phrase "Welcome" is the most appropriate for starting a formal presentation because it sets a professional and courteous tone for the audience. Beginning with "Welcome" creates an atmosphere of hospitality, signaling to attendees that their presence is valued and appreciated. It also establishes an immediate connection between the presenter and the audience, fostering a sense of engagement and inclusivity right from the outset.

Additionally, the word "Welcome" indicates readiness and opens the floor for the presenter to proceed with the content, making it a fitting introduction in a formal setting. By contrast, phrases such as "Be seated," "Listen up," and "Let's get started" may come across as less formal or even directive, which can detract from the welcoming atmosphere that is vital in a professional presentation environment.