I'll go over why the other three options are bad ideas.
Option A and B do maintain eye contact, but it'll be inferred by the audience that you're looking at solely one person.
It's pretty obvious that Option C is a terrible idea, since the point of maintaining eye contact is to be looking at your audience.
The reason Option D is the best choice is because it keeps the audience engaged. By looking around a room, your audience will infer that you're addressing everyone in the room.
Did you know that more than 7.3 million kids participated in youth sports during 2017? Girls rarely play with boys sports teams, and coaches and sports fans should be more accepting of girls on boys sports teams. Girls have the same athletic ability, girls are as strong or as tall as boys and various laws say that girls should be on the same sports teams if they choose to.
Number 3 would be the only logical choice in my opinion because everything else would be in a narrative or story of some sort. Expository essays are exclusively informational.