premise: Jefferson County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 741,096. It is the most populous county in Kentucky and is more than twice as large as the second most populous, Fayette. The county was formed in 1780 and named for future President Thomas Jefferson, who was Governor of Virginia at the time.
hypothesis: The population count of Jefferson County is over 1,000,000 as of today. 
reason: According to the context the population was at 741,096 as of 2010. 9 years on the population may well have passed the 1,000,000 mark but we have no way of knowing for sure so this statement is neither definitely correct or incorrect. I believe it was difficult for the system because it may have used maths to try and work out the rising population exactly. 