I would think B. I might be wrong
The intended audience is High school students. As the assigment explains, the presentation will be given to the speaker's classmates, that is high school students. In addition, although teachers will be present in the presentation, and will keep the results of the research, it is going to be shared with future students.
Remember that the intended audience is the group of people for whom you do something, in this case give a presentation.
Good habits... breathing exercises? Exercise in general. Everyone should take time for themselves and relax... is that a habit? Meditation, eating healthy, doing the things that are important to them, focusing on family and friends.
I hope that helps lol
