gmatquant25 wrote: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?

A. The number of Domoricans in their twenties is less than the number of Domoricans over thirty.
This is a number vs percentage trap. Various numbers could be used to still verify that the proportion is still greater

B. The number of newspapers in Domorica has been gradually increasing over the past several decades.
We need information about the readers, this one gives information about the number of newspaper.

C. The proportion of Domoricans in their twenties who regularly read a newspaper has always been low.
This points out that those in 20s would become regular readers when they cross the age of 30. Those who are currently in their 30s never read much (when they were in the 20s), but now they do read regularly!

D. The surveys defined a regular reader of a newspaper as someone who reads a newspaper more than twice a week.
Out of scope: Frequency of reading is irrelevant

E. The proportion of Domoricans who regularly read a newspaper was higher 20 years ago than it is today.
Out of scope: Just compares the trends

Source :gmatprep
OA C