In one study, researchers observed the classroom participation of nearly 300 children in grades 2 to 4 during a school year. Participation was measured based on concentration and distraction during the class. The former refers to answering questions. Raise your hands to speak or participate in discussions, the latter refers to gossiping and other behaviors. In the experiment, half of the students stood at the high desk and listened to the lesson, and the other half sat and listened. The results showed that the students who stood and listened to the class were more focused than the students sitting. Which of the following, if true, would best support the above conclusion? ['Standing requires the brain to balance the body and control slight muscle contractions. These moderate stresses will make people more focused.', "Sitting for long periods of time will increase the pressure on the spine, which is not good for students' health.", 'Even when standing up, some students will move back and forth, affecting class order and distracting others.', 'Many lively students prefer to stand and listen better, while introverted students are willing to sit and listen to the class, which is more conducive to improving their concentration.']