Surveys in Domorica indicate that only 10 percent of Domoricans in their twenties read a newspaper regularly, while more than half of all Domoricans over thirty read a newspaper regularly. Although Domoricans in their twenties constitute a large proportion of the population, newspaper publishers nonetheless predict that ten years from now, the percentage of Domoricans who regularly read a newspaper will probably be no lower than it is today. Which of the following, if true, provides the strongest grounds for the newspaper publishers' prediction? ['The proportion of Domoricans who regularly read a newspaper was higher 20 years ago than it is today.', 'The number of newspapers in Domorica has been gradually increasing over the past several decades.', 'The surveys defined a regular reader of a newspaper as someone who reads a newspaper more than twice a week.', 'The proportion of Domoricans in their twenties who regularly read a newspaper has always been low.']