A teacher conducted a test on American high school students and Chinese high school students. He asked the same question, "If a piece of A4 paper is folded in half, it can be folded several times at most. " It turns out that after hearing the problem, most American high schools Students began to origami immediately, and then answered the number of times they could fold according to the actual situation. Most Chinese high school students immediately answered the question: infinity. The teacher concluded from this: American high school students focus on practice, but China High school students focus on theory. Which of the following must be assumed by the teacher to reach a conclusion? ['Theory and practice are antagonistic.', 'As long as you start to origami and answer questions according to the actual situation, you are focusing on practice.', "As long as you start to origami and answer the question according to the actual situation, you don't pay attention to theory.", 'As long as you answer "infinite times" immediately, you don\'t pay attention to the practice.']