A research study shows that young people in the post-80s and post-90s prefer popular singing songs, but are not interested in singing methods such as Bel Canto and Nationalities, which are gradually being eliminated by the times. Which of the following is true and is the most effective refutation of the above conclusions? ['Many middle-aged people like bel canto and national singing.', 'Some young people with formal music education prefer bel canto and folk singing.', 'Popular music not only brings entertainment to young people, but also expresses their ideas and wishes more truthfully.', 'The survey shows that the popularity of Bel Canto and folk singing has steadily increased since the 1980s.']