Commentator: In many countries the influence of fringe movements is increasing. The great centrifugal engine of modern culture turns faster and faster, spinning off fashions, ideologies, religions, artistic movements, economic theories, cults, and dogmas in fabulous profusion. Hence, modern culture threatens the national identities that now exist in the world. Which one of the following statements, if true, most seriously weakens the commentator's argument? ['New national identities are often forged out of conflicts among diverse groups.', 'It is preferable to have a pluralistic rather than a monolithic national culture.', 'The rate of cultural change in most countries will soon change drastically.', 'A stable national identity is typically a composite of a staggering number of subcultures.']