Which of the following contributes significantly to an instructor's delivery?

The choice regarding personal appearance significantly contributes to an instructor's delivery because it directly impacts the perception and engagement of students in a learning environment. An instructor who presents themselves neatly and professionally is more likely to command respect and foster a positive learning atmosphere. This visual aspect can influence the audience's level of focus and receptivity, as students often respond to instructors who appear confident and put-together.

While aspects like online presence, content depth, and extra-curricular activities have their own importance in educational contexts, they do not have the same immediate effect on the instructor's delivery during a live session as personal appearance does. An instructor’s appearance can set the tone for the class and create an initial impression that can enhance or hinder student engagement. Therefore, prioritizing personal appearance helps in establishing authority, professionalism, and credibility in delivering instructional content.