Final Answer:
A person is most likely to use 1) Oral presentation in delivering a paper at a scientific conference.
Step-by-step explanation:
Oral Presentation (Option 1): Scientific conferences commonly feature oral presentations where researchers present their findings to an audience. This method allows for direct communication, enables presenters to elaborate on key points, and provides opportunities for questions and discussions.
Poster Presentation (Option 2): While poster presentations are also prevalent, they involve displaying research on a poster board, often in a designated area. Attendees can view the posters and engage in one-on-one discussions with the presenter.
Written Submission (Option 3): Written submissions are typically part of the conference proceedings but may not involve direct presentation. Attendees may access written papers or abstracts for reference.
Video Presentation (Option 4): While video presentations are becoming more common, especially in virtual conferences, oral presentations still dominate traditional scientific conferences.
Option 1 is the answer.