A major objection raised by critics of the requirement to wear uniforms in schools is that by asking students to conform to a dress-code, the requirement in effect hampers their individuality, thereby significantly limiting their opportunities to express themselves. However, such critics fail to understand that the requirement actually benefits students as it can cultivate mutual respect and discipline in them. As regards individuality, studies have shown that the real outlets for students to express themselves in schools are _______.

Which of the following logically completes the above argument?