The city depends on supplemental federal funding for its education budget, and the federal money is dependent on the city raising its cumulative high school literacy rate from the previous year. Over the past ten years, the city has received supplemental federal funding every year, but the city has had the highest illiteracy rate in the country for ten years. Which one of the following would resolve the apparent discrepancy in the passage? ['The high school literacy test is arbitrary and subject to change on a yearly basis.', "The city's manufacturing industry makes it a desirable destination for illiterate immigrants.", "The city's government is the most corrupt in the country.", 'The city increases the difficulty of the high school test for literacy every year.']