Publishers, like all private businesses, have always been concerned about profitability. But, while it used to be at least possible to get a book published that was unlikely to be popular, and hence unlikely to be a moneymaker, profitability is now the sole criterion. Thus, no matter how much literary merit a book possesses, it will not be published in today' s market if it looks like it will not be popular. Which one of the following sentences most accurately expresses the main conclusion of the argument? ['Good books are published now only if they are also likely to be popular.', 'Unpopular books are not likely to make money for the publisher.', "Books of literary merit cannot be published in today's market.", 'It is harder to get a book published today than it once was.']